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         struct rcu_work         rwork;
  72         /* The 'sel' field MUST be the last field in structure to allow for
  73          * tc_u32_keys allocated at end of structure.
  74          */
  75         struct tc_u32_sel       sel;
  76 };
  77
  78 struct tc_u_hnode {
  79         struct tc_u_hnode __rcu *next;
  80         u32                     handle;
  81         u32                     prio;
  82         struct tc_u_common      *tp_c;
  83         int                     refcnt;
  84         unsigned int            divisor;
  85         struct idr              handle_idr;
  86         struct rcu_head         rcu;
  87         u32                     flags;
  88         /* The 'ht' field MUST be the last field in structure to allow for
  89          * more entries allocated at end of structure.
  90          */
  91         struct tc_u_knode __rcu *ht[1];
  92 };
  93
  94 struct tc_u_common {
  95         struct tc_u_hnode __rcu *hlist;
  96         void                    *ptr;
  97         int                     refcnt;
  98         struct idr              handle_idr;
  99         struct hlist_node       hnode;
 100         struct rcu_head         rcu;
 101 };
 102
 103 static inline unsigned int u32_hash_fold(__be32 key,
 104                                          const struct tc_u32_sel *sel,
 105                                          u8 fshift)
 106 {
 107         unsigned int h = ntohl(key & sel->hmask) >> fshift;
 108
 109         return h;
 110 }
 111
 112 static int u32_classify(struct sk_buff *skb, const struct tcf_proto *tp,
 113                         struct tcf_result *res)
 114 {
 115         struct {
 116                 struct tc_u_knode *knode;
 117                 unsigned int      off;
 118         } stack[TC_U32_MAXDEPTH];
 119
 120         struct tc_u_hnode *ht = rcu_dereference_bh(tp->root);
 121         unsigned int off = skb_network_offset(skb);
 122         struct tc_u_knode *n;
 123         int sdepth = 0;
 124         int off2 = 0;
 125         int sel = 0;
 126 #ifdef CONFIG_CLS_U32_PERF
 127         int j;
 128 #endif
 129         int i, r;
 130
 131 next_ht:
 132         n = rcu_dereference_bh(ht->ht[sel]);
 133
 134 next_knode:
 135         if (n) {
 136                 struct tc_u32_key *key = n->sel.keys;
 137
 138 #ifdef CONFIG_CLS_U32_PERF
 139                 __this_cpu_inc(n->pf->rcnt);
 140                 j = 0;
 141 #endif
 142
 143                 if (tc_skip_sw(n->flags)) {
 144                         n = rcu_dereference_bh(n->next);
 145                         goto next_knode;
 146                 }
 147
 148 #ifdef CONFIG_CLS_U32_MARK
 149                 if ((skb->mark & n->mask) != n->val) {
 150                         n = rcu_dereference_bh(n->next);
 151                         goto next_knode;
 152                 } else {
 153                         __this_cpu_inc(*n->pcpu_success);
 154                 }
 155 #endif
 156
 157                 for (i = n->sel.nkeys; i > 0; i--, key++) {
 158                         int toff = off + key->off + (off2 & key->offmask);
 159                         __be32 *data, hdata;
 160
 161                         if (skb_headroom(skb) + toff > INT_MAX)
 162                                 goto out;
 163
 164                         data = skb_header_pointer(skb, toff, 4, &hdata);
 165                         if (!data)
 166                                 goto out;
 167                         if ((*data ^ key->val) & key->mask) {
 168                                 n = rcu_dereference_bh(n->next);
 169                                 goto next_knode;
 170                         }
 171 #ifdef CONFIG_CLS_U32_PERF
 172                         __this_cpu_inc(n->pf->kcnts[j]);
 173                         j++;
 174 #endif
 175                 }
 176
 177                 ht = rcu_dereference_bh(n->ht_down);
 178                 if (!ht) {
 179 check_terminal:
 180                         if (n->sel.flags & TC_U32_TERMINAL) {
 181
 182                                 *res = n->res;
 183 #ifdef CONFIG_NET_CLS_IND
 184                                 if (!tcf_match_indev(skb, n->ifindex)) {
 185                                         n = rcu_dereference_bh(n->next);
 186                                         goto next_knode;
 187                                 }
 188 #endif
 189 #ifdef CONFIG_CLS_U32_PERF
 190                                 __this_cpu_inc(n->pf->rhit);
 191 #endif
 192                                 r = tcf_exts_exec(skb, &n->exts, res);
 193                                 if (r < 0) {
 194                                         n = rcu_dereference_bh(n->next);
 195                                         goto next_knode;
 196                                 }
 197
 198                                 return r;
 199                         }
 200                         n = rcu_dereference_bh(n->next);
 201                         goto next_knode;
 202                 }
 203
 204                 /* PUSH */
 205                 if (sdepth >= TC_U32_MAXDEPTH)
 206                         goto deadloop;
 207                 stack[sdepth].knode = n;
 208                 stack[sdepth].off = off;
 209                 sdepth++;
 210
 211                 ht = rcu_dereference_bh(n->ht_down);
 212                 sel = 0;
 213                 if (ht->divisor) {
 214                         __be32 *data, hdata;
 215
 216                         data = skb_header_pointer(skb, off + n->sel.hoff, 4,
 217                                                   &hdata);
 218                         if (!data)
 219                                 goto out;
 220                         sel = ht->divisor & u32_hash_fold(*data, &n->sel,
 221                                                           n->fshift);
 222                 }
 223                 if (!(n->sel.flags & (TC_U32_VAROFFSET | TC_U32_OFFSET | TC_U32_EAT)))
 224                         goto next_ht;
 225
 226                 if (n->sel.flags & (TC_U32_OFFSET | TC_U32_VAROFFSET)) {
 227                         off2 = n->sel.off + 3;
 228                         if (n->sel.flags & TC_U32_VAROFFSET) {
 229                                 __be16 *data, hdata;
 230
 231                                 data = skb_header_pointer(skb,
 232                                                           off + n->sel.offoff,
 233                                                           2, &hdata);
 234                                 if (!data)
 235                                         goto out;
 236                                 off2 += ntohs(n->sel.offmask & *data) >>
 237                                         n->sel.offshift;
 238                         }
 239                         off2 &= ~3;
 240                 }
 241                 if (n->sel.flags & TC_U32_EAT) {
 242                         off += off2;
 243                         off2 = 0;
 244                 }
 245
 246                 if (off < skb->len)
 247                         goto next_ht;
 248         }
 249
 250         /* POP */
 251         if (sdepth--) {
 252                 n = stack[sdepth].knode;
 253                 ht = rcu_dereference_bh(n->ht_up);
 254                 off = stack[sdepth].off;
 255                 goto check_terminal;
 256         }
 257 out:
 258         return -1;
 259
 260 deadloop:
 261         net_warn_ratelimited("cls_u32: dead loop\n");
 262         return -1;
 263 }
 264
 265 static struct tc_u_hnode *u32_lookup_ht(struct tc_u_common *tp_c, u32 handle)
 266 {
 267         struct tc_u_hnode *ht;
 268
 269         for (ht = rtnl_dereference(tp_c->hlist);
 270              ht;
 271              ht = rtnl_dereference(ht->next))
 272                 if (ht->handle == handle)
 273                         break;
 274
 275         return ht;
 276 }
 277
 278 static struct tc_u_knode *u32_lookup_key(struct tc_u_hnode *ht, u32 handle)
 279 {
 280         unsigned int sel;
 281         struct tc_u_knode *n = NULL;
 282
 283         sel = TC_U32_HASH(handle);
 284         if (sel > ht->divisor)
 285                 goto out;
 286
 287         for (n = rtnl_dereference(ht->ht[sel]);
 288              n;
 289              n = rtnl_dereference(n->next))
 290                 if (n->handle == handle)
 291                         break;
 292 out:
 293         return n;
 294 }
 295
 296
 297 static void *u32_get(struct tcf_proto *tp, u32 handle)
 298 {
 299         struct tc_u_hnode *ht;
 300         struct tc_u_common *tp_c = tp->data;
 301
 302         if (TC_U32_HTID(handle) == TC_U32_ROOT)
 303                 ht = rtnl_dereference(tp->root);
 304         else
 305                 ht = u32_lookup_ht(tp_c, TC_U32_HTID(handle));
 306
 307         if (!ht)
 308                 return NULL;
 309
 310         if (TC_U32_KEY(handle) == 0)
 311                 return ht;
 312
 313         return u32_lookup_key(ht, handle);
 314 }
 315
 316 /* Protected by rtnl lock */
 317 static u32 gen_new_htid(struct tc_u_common *tp_c, struct tc_u_hnode *ptr)
 318 {
 319         int id = idr_alloc_cyclic(&tp_c->handle_idr, ptr, 1, 0x7FF, GFP_KERNEL);
 320         if (id < 0)
 321                 return 0;
 322         return (id | 0x800U) << 20;
 323 }
 324
 325 static struct hlist_head *tc_u_common_hash;
 326
 327 #define U32_HASH_SHIFT 10
 328 #define U32_HASH_SIZE (1 << U32_HASH_SHIFT)
 329
 330 static void *tc_u_common_ptr(const struct tcf_proto *tp)
 331 {
 332         struct tcf_block *block = tp->chain->block;
 333
 334         /* The block sharing is currently supported only
 335          * for classless qdiscs. In that case we use block
 336          * for tc_u_common identification. In case the
 337          * block is not shared, block->q is a valid pointer
 338          * and we can use that. That works for classful qdiscs.
 339          */
 340         if (tcf_block_shared(block))
 341                 return block;
 342         else
 343                 return block->q;
 344 }
 345
 346 static unsigned int tc_u_hash(const struct tcf_proto *tp)
 347 {
 348         return hash_ptr(tc_u_common_ptr(tp), U32_HASH_SHIFT);
 349 }
 350
 351 static struct tc_u_common *tc_u_common_find(const struct tcf_proto *tp)
 352 {
 353         struct tc_u_common *tc;
 354         unsigned int h;
 355
 356         h = tc_u_hash(tp);
 357         hlist_for_each_entry(tc, &tc_u_common_hash[h], hnode) {
 358                 if (tc->ptr == tc_u_common_ptr(tp))
 359                         return tc;
 360         }
 361         return NULL;
 362 }
 363
 364 static int u32_init(struct tcf_proto *tp)
 365 {
 366         struct tc_u_hnode *root_ht;
 367         struct tc_u_common *tp_c;
 368         unsigned int h;
 369
 370         tp_c = tc_u_common_find(tp);
 371
 372         root_ht = kzalloc(sizeof(*root_ht), GFP_KERNEL);
 373         if (root_ht == NULL)
 374                 return -ENOBUFS;
 375
 376         root_ht->refcnt++;
 377         root_ht->handle = tp_c ? gen_new_htid(tp_c, root_ht) : 0x80000000;
 378         root_ht->prio = tp->prio;
 379         idr_init(&root_ht->handle_idr);
 380
 381         if (tp_c == NULL) {
 382                 tp_c = kzalloc(sizeof(*tp_c), GFP_KERNEL);
 383                 if (tp_c == NULL) {
 384                         kfree(root_ht);
 385                         return -ENOBUFS;
 386                 }
 387                 tp_c->ptr = tc_u_common_ptr(tp);
 388                 INIT_HLIST_NODE(&tp_c->hnode);
 389                 idr_init(&tp_c->handle_idr);
 390
 391                 h = tc_u_hash(tp);
 392                 hlist_add_head(&tp_c->hnode, &tc_u_common_hash[h]);
 393         }
 394
 395         tp_c->refcnt++;
 396         RCU_INIT_POINTER(root_ht->next, tp_c->hlist);
 397         rcu_assign_pointer(tp_c->hlist, root_ht);
 398         root_ht->tp_c = tp_c;
 399
 400         rcu_assign_pointer(tp->root, root_ht);
 401         tp->data = tp_c;
 402         return 0;
 403 }
 404
 405 static int u32_destroy_key(struct tcf_proto *tp, struct tc_u_knode *n,
 406                            bool free_pf)
 407 {
 408         struct tc_u_hnode *ht = rtnl_dereference(n->ht_down);
 409
 410         tcf_exts_destroy(&n->exts);
 411         tcf_exts_put_net(&n->exts);
 412         if (ht && --ht->refcnt == 0)
 413                 kfree(ht);
 414 #ifdef CONFIG_CLS_U32_PERF
 415         if (free_pf)
 416                 free_percpu(n->pf);
 417 #endif
 418 #ifdef CONFIG_CLS_U32_MARK
 419         if (free_pf)
 420                 free_percpu(n->pcpu_success);
 421 #endif
 422         kfree(n);
 423         return 0;
 424 }
 425
 426 /* u32_delete_key_rcu should be called when free'ing a copied
 427  * version of a tc_u_knode obtained from u32_init_knode(). When
 428  * copies are obtained from u32_init_knode() the statistics are
 429  * shared between the old and new copies to allow readers to
 430  * continue to update the statistics during the copy. To support
 431  * this the u32_delete_key_rcu variant does not free the percpu
 432  * statistics.
 433  */
 434 static void u32_delete_key_work(struct work_struct *work)
 435 {
 436         struct tc_u_knode *key = container_of(to_rcu_work(work),
 437                                               struct tc_u_knode,
 438                                               rwork);
 439         rtnl_lock();
 440         u32_destroy_key(key->tp, key, false);
 441         rtnl_unlock();
 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(to_rcu_work(work),
 454                                               struct tc_u_knode,
 455                                               rwork);
 456         rtnl_lock();
 457         u32_destroy_key(key->tp, key, true);
 458         rtnl_unlock();
 459 }
 460
 461 static int u32_delete_key(struct tcf_proto *tp, struct tc_u_knode *key)
 462 {
 463         struct tc_u_knode __rcu **kp;
 464         struct tc_u_knode *pkp;
 465         struct tc_u_hnode *ht = rtnl_dereference(key->ht_up);
 466
 467         if (ht) {
 468                 kp = &ht->ht[TC_U32_HASH(key->handle)];
 469                 for (pkp = rtnl_dereference(*kp); pkp;
 470                      kp = &pkp->next, pkp = rtnl_dereference(*kp)) {
 471                         if (pkp == key) {
 472                                 RCU_INIT_POINTER(*kp, key->next);
 473
 474                                 tcf_unbind_filter(tp, &key->res);
 475                                 idr_remove(&ht->handle_idr, key->handle);
 476                                 tcf_exts_get_net(&key->exts);
 477                                 tcf_queue_work(&key->rwork, u32_delete_key_freepf_work);
 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                                 tcf_queue_work(&n->rwork, u32_delete_key_freepf_work);
 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                     ~(TCA_CLS_FLAGS_IN_HW | TCA_CLS_FLAGS_NOT_IN_HW)) {
 952                         NL_SET_ERR_MSG_MOD(extack, "Key node flags do not match passed flags");
 953                         return -EINVAL;
 954                 }
 955
 956                 new = u32_init_knode(tp, n);
 957                 if (!new)
 958                         return -ENOMEM;
 959
 960                 err = u32_set_parms(net, tp, base,
 961                                     rtnl_dereference(n->ht_up), new, tb,
 962                                     tca[TCA_RATE], ovr, extack);
 963
 964                 if (err) {
 965                         u32_destroy_key(tp, new, false);
 966                         return err;
 967                 }
 968
 969                 err = u32_replace_hw_knode(tp, new, flags, extack);
 970                 if (err) {
 971                         u32_destroy_key(tp, new, false);
 972                         return err;
 973                 }
 974
 975                 if (!tc_in_hw(new->flags))
 976                         new->flags |= TCA_CLS_FLAGS_NOT_IN_HW;
 977
 978                 u32_replace_knode(tp, tp_c, new);
 979                 tcf_unbind_filter(tp, &n->res);
 980                 tcf_exts_get_net(&n->exts);
 981                 tcf_queue_work(&n->rwork, u32_delete_key_work);
 982                 return 0;
 983         }
 984
 985         if (tb[TCA_U32_DIVISOR]) {
 986                 unsigned int divisor = nla_get_u32(tb[TCA_U32_DIVISOR]);
 987
 988                 if (--divisor > 0x100) {
 989                         NL_SET_ERR_MSG_MOD(extack, "Exceeded maximum 256 hash buckets");
 990                         return -EINVAL;
 991                 }
 992                 if (TC_U32_KEY(handle)) {
 993                         NL_SET_ERR_MSG_MOD(extack, "Divisor can only be used on a hash table");
 994                         return -EINVAL;
 995                 }
 996                 ht = kzalloc(sizeof(*ht) + divisor*sizeof(void *), GFP_KERNEL);
 997                 if (ht == NULL)
 998                         return -ENOBUFS;
 999                 if (handle == 0) {
1000                         handle = gen_new_htid(tp->data, ht);
1001                         if (handle == 0) {
1002                                 kfree(ht);
1003                                 return -ENOMEM;
1004                         }
1005                 } else {
1006                         err = idr_alloc_u32(&tp_c->handle_idr, ht, &handle,
1007                                             handle, GFP_KERNEL);
1008                         if (err) {
1009                                 kfree(ht);
1010                                 return err;
1011                         }
1012                 }
1013                 ht->tp_c = tp_c;
1014                 ht->refcnt = 1;
1015                 ht->divisor = divisor;
1016                 ht->handle = handle;
1017                 ht->prio = tp->prio;
1018                 idr_init(&ht->handle_idr);
1019                 ht->flags = flags;
1020
1021                 err = u32_replace_hw_hnode(tp, ht, flags, extack);
1022                 if (err) {
1023                         idr_remove(&tp_c->handle_idr, handle);
1024                         kfree(ht);
1025                         return err;
1026                 }
1027
1028                 RCU_INIT_POINTER(ht->next, tp_c->hlist);
1029                 rcu_assign_pointer(tp_c->hlist, ht);
1030                 *arg = ht;
1031
1032                 return 0;
1033         }
1034
1035         if (tb[TCA_U32_HASH]) {
1036                 htid = nla_get_u32(tb[TCA_U32_HASH]);
1037                 if (TC_U32_HTID(htid) == TC_U32_ROOT) {
1038                         ht = rtnl_dereference(tp->root);
1039                         htid = ht->handle;
1040                 } else {
1041                         ht = u32_lookup_ht(tp->data, TC_U32_HTID(htid));
1042                         if (!ht) {
1043                                 NL_SET_ERR_MSG_MOD(extack, "Specified hash table not found");
1044                                 return -EINVAL;
1045                         }
1046                 }
1047         } else {
1048                 ht = rtnl_dereference(tp->root);
1049                 htid = ht->handle;
1050         }
1051
1052         if (ht->divisor < TC_U32_HASH(htid)) {
1053                 NL_SET_ERR_MSG_MOD(extack, "Specified hash table buckets exceed configured value");
1054                 return -EINVAL;
1055         }
1056
1057         if (handle) {
1058                 if (TC_U32_HTID(handle) && TC_U32_HTID(handle ^ htid)) {
1059                         NL_SET_ERR_MSG_MOD(extack, "Handle specified hash table address mismatch");
1060                         return -EINVAL;
1061                 }
1062                 handle = htid | TC_U32_NODE(handle);
1063                 err = idr_alloc_u32(&ht->handle_idr, NULL, &handle, handle,
1064                                     GFP_KERNEL);
1065                 if (err)
1066                         return err;
1067         } else
1068                 handle = gen_new_kid(ht, htid);
1069
1070         if (tb[TCA_U32_SEL] == NULL) {
1071                 NL_SET_ERR_MSG_MOD(extack, "Selector not specified");
1072                 err = -EINVAL;
1073                 goto erridr;
1074         }
1075
1076         s = nla_data(tb[TCA_U32_SEL]);
1077
1078         n = kzalloc(sizeof(*n) + s->nkeys*sizeof(struct tc_u32_key), GFP_KERNEL);
1079         if (n == NULL) {
1080                 err = -ENOBUFS;
1081                 goto erridr;
1082         }
1083
1084 #ifdef CONFIG_CLS_U32_PERF
1085         size = sizeof(struct tc_u32_pcnt) + s->nkeys * sizeof(u64);
1086         n->pf = __alloc_percpu(size, __alignof__(struct tc_u32_pcnt));
1087         if (!n->pf) {
1088                 err = -ENOBUFS;
1089                 goto errfree;
1090         }
1091 #endif
1092
1093         memcpy(&n->sel, s, sizeof(*s) + s->nkeys*sizeof(struct tc_u32_key));
1094         RCU_INIT_POINTER(n->ht_up, ht);
1095         n->handle = handle;
1096         n->fshift = s->hmask ? ffs(ntohl(s->hmask)) - 1 : 0;
1097         n->flags = flags;
1098         n->tp = tp;
1099
1100         err = tcf_exts_init(&n->exts, TCA_U32_ACT, TCA_U32_POLICE);
1101         if (err < 0)
1102                 goto errout;
1103
1104 #ifdef CONFIG_CLS_U32_MARK
1105         n->pcpu_success = alloc_percpu(u32);
1106         if (!n->pcpu_success) {
1107                 err = -ENOMEM;
1108                 goto errout;
1109         }
1110
1111         if (tb[TCA_U32_MARK]) {
1112                 struct tc_u32_mark *mark;
1113
1114                 mark = nla_data(tb[TCA_U32_MARK]);
1115                 n->val = mark->val;
1116                 n->mask = mark->mask;
1117         }
1118 #endif
1119
1120         err = u32_set_parms(net, tp, base, ht, n, tb, tca[TCA_RATE], ovr,
1121                             extack);
1122         if (err == 0) {
1123                 struct tc_u_knode __rcu **ins;
1124                 struct tc_u_knode *pins;
1125
1126                 err = u32_replace_hw_knode(tp, n, flags, extack);
1127                 if (err)
1128                         goto errhw;
1129
1130                 if (!tc_in_hw(n->flags))
1131                         n->flags |= TCA_CLS_FLAGS_NOT_IN_HW;
1132
1133                 ins = &ht->ht[TC_U32_HASH(handle)];
1134                 for (pins = rtnl_dereference(*ins); pins;
1135                      ins = &pins->next, pins = rtnl_dereference(*ins))
1136                         if (TC_U32_NODE(handle) < TC_U32_NODE(pins->handle))
1137                                 break;
1138
1139                 RCU_INIT_POINTER(n->next, pins);
1140                 rcu_assign_pointer(*ins, n);
1141                 *arg = n;
1142                 return 0;
1143         }
1144
1145 errhw:
1146 #ifdef CONFIG_CLS_U32_MARK
1147         free_percpu(n->pcpu_success);
1148 #endif
1149
1150 errout:
1151         tcf_exts_destroy(&n->exts);
1152 #ifdef CONFIG_CLS_U32_PERF
1153 errfree:
1154         free_percpu(n->pf);
1155 #endif
1156         kfree(n);
1157 erridr:
1158         idr_remove(&ht->handle_idr, handle);
1159         return err;
1160 }
1161
1162 static void u32_walk(struct tcf_proto *tp, struct tcf_walker *arg)
1163 {
1164         struct tc_u_common *tp_c = tp->data;
1165         struct tc_u_hnode *ht;
1166         struct tc_u_knode *n;
1167         unsigned int h;
1168
1169         if (arg->stop)
1170                 return;
1171
1172         for (ht = rtnl_dereference(tp_c->hlist);
1173              ht;
1174              ht = rtnl_dereference(ht->next)) {
1175                 if (ht->prio != tp->prio)
1176                         continue;
1177                 if (arg->count >= arg->skip) {
1178                         if (arg->fn(tp, ht, arg) < 0) {
1179                                 arg->stop = 1;
1180                                 return;
1181                         }
1182                 }
1183                 arg->count++;
1184                 for (h = 0; h <= ht->divisor; h++) {
1185                         for (n = rtnl_dereference(ht->ht[h]);
1186                              n;
1187                              n = rtnl_dereference(n->next)) {
1188                                 if (arg->count < arg->skip) {
1189                                         arg->count++;
1190                                         continue;
1191                                 }
1192                                 if (arg->fn(tp, n, arg) < 0) {
1193                                         arg->stop = 1;
1194                                         return;
1195                                 }
1196                                 arg->count++;
1197                         }
1198                 }
1199         }
1200 }
1201
1202 static void u32_bind_class(void *fh, u32 classid, unsigned long cl)
1203 {
1204         struct tc_u_knode *n = fh;
1205
1206         if (n && n->res.classid == classid)
1207                 n->res.class = cl;
1208 }
1209
1210 static int u32_dump(struct net *net, struct tcf_proto *tp, void *fh,
1211                     struct sk_buff *skb, struct tcmsg *t)
1212 {
1213         struct tc_u_knode *n = fh;
1214         struct tc_u_hnode *ht_up, *ht_down;
1215         struct nlattr *nest;
1216
1217         if (n == NULL)
1218                 return skb->len;
1219
1220         t->tcm_handle = n->handle;
1221
1222         nest = nla_nest_start(skb, TCA_OPTIONS);
1223         if (nest == NULL)
1224                 goto nla_put_failure;
1225
1226         if (TC_U32_KEY(n->handle) == 0) {
1227                 struct tc_u_hnode *ht = fh;
1228                 u32 divisor = ht->divisor + 1;
1229
1230                 if (nla_put_u32(skb, TCA_U32_DIVISOR, divisor))
1231                         goto nla_put_failure;
1232         } else {
1233 #ifdef CONFIG_CLS_U32_PERF
1234                 struct tc_u32_pcnt *gpf;
1235                 int cpu;
1236 #endif
1237
1238                 if (nla_put(skb, TCA_U32_SEL,
1239                             sizeof(n->sel) + n->sel.nkeys*sizeof(struct tc_u32_key),
1240                             &n->sel))
1241                         goto nla_put_failure;
1242
1243                 ht_up = rtnl_dereference(n->ht_up);
1244                 if (ht_up) {
1245                         u32 htid = n->handle & 0xFFFFF000;
1246                         if (nla_put_u32(skb, TCA_U32_HASH, htid))
1247                                 goto nla_put_failure;
1248                 }
1249                 if (n->res.classid &&
1250                     nla_put_u32(skb, TCA_U32_CLASSID, n->res.classid))
1251                         goto nla_put_failure;
1252
1253                 ht_down = rtnl_dereference(n->ht_down);
1254                 if (ht_down &&
1255                     nla_put_u32(skb, TCA_U32_LINK, ht_down->handle))
1256                         goto nla_put_failure;
1257
1258                 if (n->flags && nla_put_u32(skb, TCA_U32_FLAGS, n->flags))
1259                         goto nla_put_failure;
1260
1261 #ifdef CONFIG_CLS_U32_MARK
1262                 if ((n->val || n->mask)) {
1263                         struct tc_u32_mark mark = {.val = n->val,
1264                                                    .mask = n->mask,
1265                                                    .success = 0};
1266                         int cpum;
1267
1268                         for_each_possible_cpu(cpum) {
1269                                 __u32 cnt = *per_cpu_ptr(n->pcpu_success, cpum);
1270
1271                                 mark.success += cnt;
1272                         }
1273
1274                         if (nla_put(skb, TCA_U32_MARK, sizeof(mark), &mark))
1275                                 goto nla_put_failure;
1276                 }
1277 #endif
1278
1279                 if (tcf_exts_dump(skb, &n->exts) < 0)
1280                         goto nla_put_failure;
1281
1282 #ifdef CONFIG_NET_CLS_IND
1283                 if (n->ifindex) {
1284                         struct net_device *dev;
1285                         dev = __dev_get_by_index(net, n->ifindex);
1286                         if (dev && nla_put_string(skb, TCA_U32_INDEV, dev->name))
1287                                 goto nla_put_failure;
1288                 }
1289 #endif
1290 #ifdef CONFIG_CLS_U32_PERF
1291                 gpf = kzalloc(sizeof(struct tc_u32_pcnt) +
1292                               n->sel.nkeys * sizeof(u64),
1293                               GFP_KERNEL);
1294                 if (!gpf)
1295                         goto nla_put_failure;
1296
1297                 for_each_possible_cpu(cpu) {
1298                         int i;
1299                         struct tc_u32_pcnt *pf = per_cpu_ptr(n->pf, cpu);
1300
1301                         gpf->rcnt += pf->rcnt;
1302                         gpf->rhit += pf->rhit;
1303                         for (i = 0; i < n->sel.nkeys; i++)
1304                                 gpf->kcnts[i] += pf->kcnts[i];
1305                 }
1306
1307                 if (nla_put_64bit(skb, TCA_U32_PCNT,
1308                                   sizeof(struct tc_u32_pcnt) +
1309                                   n->sel.nkeys * sizeof(u64),
1310                                   gpf, TCA_U32_PAD)) {
1311                         kfree(gpf);
1312                         goto nla_put_failure;
1313                 }
1314                 kfree(gpf);
1315 #endif
1316         }
1317
1318         nla_nest_end(skb, nest);
1319
1320         if (TC_U32_KEY(n->handle))
1321                 if (tcf_exts_dump_stats(skb, &n->exts) < 0)
1322                         goto nla_put_failure;
1323         return skb->len;
1324
1325 nla_put_failure:
1326         nla_nest_cancel(skb, nest);
1327         return -1;
1328 }
1329
1330 static struct tcf_proto_ops cls_u32_ops __read_mostly = {
1331         .kind           =       "u32",
1332         .classify       =       u32_classify,
1333         .init           =       u32_init,
1334         .destroy        =       u32_destroy,
1335         .get            =       u32_get,
1336         .change         =       u32_change,
1337         .delete         =       u32_delete,
1338         .walk           =       u32_walk,
1339         .dump           =       u32_dump,
1340         .bind_class     =       u32_bind_class,
1341         .owner          =       THIS_MODULE,
1342 };
1343
1344 static int __init init_u32(void)
1345 {
1346         int i, ret;
1347
1348         pr_info("u32 classifier\n");
1349 #ifdef CONFIG_CLS_U32_PERF
1350         pr_info("    Performance counters on\n");
1351 #endif
1352 #ifdef CONFIG_NET_CLS_IND
1353         pr_info("    input device check on\n");
1354 #endif
1355 #ifdef CONFIG_NET_CLS_ACT
1356         pr_info("    Actions configured\n");
1357 #endif
1358         tc_u_common_hash = kvmalloc_array(U32_HASH_SIZE,
1359                                           sizeof(struct hlist_head),
1360                                           GFP_KERNEL);
1361         if (!tc_u_common_hash)
1362                 return -ENOMEM;
1363
1364         for (i = 0; i < U32_HASH_SIZE; i++)
1365                 INIT_HLIST_HEAD(&tc_u_common_hash[i]);
1366
1367         ret = register_tcf_proto_ops(&cls_u32_ops);
1368         if (ret)
1369                 kvfree(tc_u_common_hash);
1370         return ret;
1371 }
1372
1373 static void __exit exit_u32(void)
1374 {
1375         unregister_tcf_proto_ops(&cls_u32_ops);
1376         kvfree(tc_u_common_hash);
1377 }
1378
1379 module_init(init_u32)
1380 module_exit(exit_u32)
1381 MODULE_LICENSE("GPL");