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         void                    *ptr;
 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 void *tc_u_common_ptr(const struct tcf_proto *tp)
 334 {
 335         struct tcf_block *block = tp->chain->block;
 336
 337         /* The block sharing is currently supported only
 338          * for classless qdiscs. In that case we use block
 339          * for tc_u_common identification. In case the
 340          * block is not shared, block->q is a valid pointer
 341          * and we can use that. That works for classful qdiscs.
 342          */
 343         if (tcf_block_shared(block))
 344                 return block;
 345         else
 346                 return block->q;
 347 }
 348
 349 static unsigned int tc_u_hash(const struct tcf_proto *tp)
 350 {
 351         return hash_ptr(tc_u_common_ptr(tp), U32_HASH_SHIFT);
 352 }
 353
 354 static struct tc_u_common *tc_u_common_find(const struct tcf_proto *tp)
 355 {
 356         struct tc_u_common *tc;
 357         unsigned int h;
 358
 359         h = tc_u_hash(tp);
 360         hlist_for_each_entry(tc, &tc_u_common_hash[h], hnode) {
 361                 if (tc->ptr == tc_u_common_ptr(tp))
 362                         return tc;
 363         }
 364         return NULL;
 365 }
 366
 367 static int u32_init(struct tcf_proto *tp)
 368 {
 369         struct tc_u_hnode *root_ht;
 370         struct tc_u_common *tp_c;
 371         unsigned int h;
 372
 373         tp_c = tc_u_common_find(tp);
 374
 375         root_ht = kzalloc(sizeof(*root_ht), GFP_KERNEL);
 376         if (root_ht == NULL)
 377                 return -ENOBUFS;
 378
 379         root_ht->refcnt++;
 380         root_ht->handle = tp_c ? gen_new_htid(tp_c, root_ht) : 0x80000000;
 381         root_ht->prio = tp->prio;
 382         idr_init(&root_ht->handle_idr);
 383
 384         if (tp_c == NULL) {
 385                 tp_c = kzalloc(sizeof(*tp_c), GFP_KERNEL);
 386                 if (tp_c == NULL) {
 387                         kfree(root_ht);
 388                         return -ENOBUFS;
 389                 }
 390                 tp_c->ptr = tc_u_common_ptr(tp);
 391                 INIT_HLIST_NODE(&tp_c->hnode);
 392                 idr_init(&tp_c->handle_idr);
 393
 394                 h = tc_u_hash(tp);
 395                 hlist_add_head(&tp_c->hnode, &tc_u_common_hash[h]);
 396         }
 397
 398         tp_c->refcnt++;
 399         RCU_INIT_POINTER(root_ht->next, tp_c->hlist);
 400         rcu_assign_pointer(tp_c->hlist, root_ht);
 401         root_ht->tp_c = tp_c;
 402
 403         rcu_assign_pointer(tp->root, root_ht);
 404         tp->data = tp_c;
 405         return 0;
 406 }
 407
 408 static int u32_destroy_key(struct tcf_proto *tp, struct tc_u_knode *n,
 409                            bool free_pf)
 410 {
 411         struct tc_u_hnode *ht = rtnl_dereference(n->ht_down);
 412
 413         tcf_exts_destroy(&n->exts);
 414         tcf_exts_put_net(&n->exts);
 415         if (ht && --ht->refcnt == 0)
 416                 kfree(ht);
 417 #ifdef CONFIG_CLS_U32_PERF
 418         if (free_pf)
 419                 free_percpu(n->pf);
 420 #endif
 421 #ifdef CONFIG_CLS_U32_MARK
 422         if (free_pf)
 423                 free_percpu(n->pcpu_success);
 424 #endif
 425         kfree(n);
 426         return 0;
 427 }
 428
 429 /* u32_delete_key_rcu should be called when free'ing a copied
 430  * version of a tc_u_knode obtained from u32_init_knode(). When
 431  * copies are obtained from u32_init_knode() the statistics are
 432  * shared between the old and new copies to allow readers to
 433  * continue to update the statistics during the copy. To support
 434  * this the u32_delete_key_rcu variant does not free the percpu
 435  * statistics.
 436  */
 437 static void u32_delete_key_work(struct work_struct *work)
 438 {
 439         struct tc_u_knode *key = container_of(work, struct tc_u_knode, work);
 440
 441         rtnl_lock();
 442         u32_destroy_key(key->tp, key, false);
 443         rtnl_unlock();
 444 }
 445
 446 static void u32_delete_key_rcu(struct rcu_head *rcu)
 447 {
 448         struct tc_u_knode *key = container_of(rcu, struct tc_u_knode, rcu);
 449
 450         INIT_WORK(&key->work, u32_delete_key_work);
 451         tcf_queue_work(&key->work);
 452 }
 453
 454 /* u32_delete_key_freepf_rcu is the rcu callback variant
 455  * that free's the entire structure including the statistics
 456  * percpu variables. Only use this if the key is not a copy
 457  * returned by u32_init_knode(). See u32_delete_key_rcu()
 458  * for the variant that should be used with keys return from
 459  * u32_init_knode()
 460  */
 461 static void u32_delete_key_freepf_work(struct work_struct *work)
 462 {
 463         struct tc_u_knode *key = container_of(work, struct tc_u_knode, work);
 464
 465         rtnl_lock();
 466         u32_destroy_key(key->tp, key, true);
 467         rtnl_unlock();
 468 }
 469
 470 static void u32_delete_key_freepf_rcu(struct rcu_head *rcu)
 471 {
 472         struct tc_u_knode *key = container_of(rcu, struct tc_u_knode, rcu);
 473
 474         INIT_WORK(&key->work, u32_delete_key_freepf_work);
 475         tcf_queue_work(&key->work);
 476 }
 477
 478 static int u32_delete_key(struct tcf_proto *tp, struct tc_u_knode *key)
 479 {
 480         struct tc_u_knode __rcu **kp;
 481         struct tc_u_knode *pkp;
 482         struct tc_u_hnode *ht = rtnl_dereference(key->ht_up);
 483
 484         if (ht) {
 485                 kp = &ht->ht[TC_U32_HASH(key->handle)];
 486                 for (pkp = rtnl_dereference(*kp); pkp;
 487                      kp = &pkp->next, pkp = rtnl_dereference(*kp)) {
 488                         if (pkp == key) {
 489                                 RCU_INIT_POINTER(*kp, key->next);
 490
 491                                 tcf_unbind_filter(tp, &key->res);
 492                                 idr_remove(&ht->handle_idr, key->handle);
 493                                 tcf_exts_get_net(&key->exts);
 494                                 call_rcu(&key->rcu, u32_delete_key_freepf_rcu);
 495                                 return 0;
 496                         }
 497                 }
 498         }
 499         WARN_ON(1);
 500         return 0;
 501 }
 502
 503 static void u32_clear_hw_hnode(struct tcf_proto *tp, struct tc_u_hnode *h,
 504                                struct netlink_ext_ack *extack)
 505 {
 506         struct tcf_block *block = tp->chain->block;
 507         struct tc_cls_u32_offload cls_u32 = {};
 508
 509         tc_cls_common_offload_init(&cls_u32.common, tp, h->flags, extack);
 510         cls_u32.command = TC_CLSU32_DELETE_HNODE;
 511         cls_u32.hnode.divisor = h->divisor;
 512         cls_u32.hnode.handle = h->handle;
 513         cls_u32.hnode.prio = h->prio;
 514
 515         tc_setup_cb_call(block, NULL, TC_SETUP_CLSU32, &cls_u32, false);
 516 }
 517
 518 static int u32_replace_hw_hnode(struct tcf_proto *tp, struct tc_u_hnode *h,
 519                                 u32 flags, struct netlink_ext_ack *extack)
 520 {
 521         struct tcf_block *block = tp->chain->block;
 522         struct tc_cls_u32_offload cls_u32 = {};
 523         bool skip_sw = tc_skip_sw(flags);
 524         bool offloaded = false;
 525         int err;
 526
 527         tc_cls_common_offload_init(&cls_u32.common, tp, flags, extack);
 528         cls_u32.command = TC_CLSU32_NEW_HNODE;
 529         cls_u32.hnode.divisor = h->divisor;
 530         cls_u32.hnode.handle = h->handle;
 531         cls_u32.hnode.prio = h->prio;
 532
 533         err = tc_setup_cb_call(block, NULL, TC_SETUP_CLSU32, &cls_u32, skip_sw);
 534         if (err < 0) {
 535                 u32_clear_hw_hnode(tp, h, NULL);
 536                 return err;
 537         } else if (err > 0) {
 538                 offloaded = true;
 539         }
 540
 541         if (skip_sw && !offloaded)
 542                 return -EINVAL;
 543
 544         return 0;
 545 }
 546
 547 static void u32_remove_hw_knode(struct tcf_proto *tp, struct tc_u_knode *n,
 548                                 struct netlink_ext_ack *extack)
 549 {
 550         struct tcf_block *block = tp->chain->block;
 551         struct tc_cls_u32_offload cls_u32 = {};
 552
 553         tc_cls_common_offload_init(&cls_u32.common, tp, n->flags, extack);
 554         cls_u32.command = TC_CLSU32_DELETE_KNODE;
 555         cls_u32.knode.handle = n->handle;
 556
 557         tc_setup_cb_call(block, NULL, TC_SETUP_CLSU32, &cls_u32, false);
 558         tcf_block_offload_dec(block, &n->flags);
 559 }
 560
 561 static int u32_replace_hw_knode(struct tcf_proto *tp, struct tc_u_knode *n,
 562                                 u32 flags, struct netlink_ext_ack *extack)
 563 {
 564         struct tc_u_hnode *ht = rtnl_dereference(n->ht_down);
 565         struct tcf_block *block = tp->chain->block;
 566         struct tc_cls_u32_offload cls_u32 = {};
 567         bool skip_sw = tc_skip_sw(flags);
 568         int err;
 569
 570         tc_cls_common_offload_init(&cls_u32.common, tp, flags, extack);
 571         cls_u32.command = TC_CLSU32_REPLACE_KNODE;
 572         cls_u32.knode.handle = n->handle;
 573         cls_u32.knode.fshift = n->fshift;
 574 #ifdef CONFIG_CLS_U32_MARK
 575         cls_u32.knode.val = n->val;
 576         cls_u32.knode.mask = n->mask;
 577 #else
 578         cls_u32.knode.val = 0;
 579         cls_u32.knode.mask = 0;
 580 #endif
 581         cls_u32.knode.sel = &n->sel;
 582         cls_u32.knode.exts = &n->exts;
 583         if (n->ht_down)
 584                 cls_u32.knode.link_handle = ht->handle;
 585
 586         err = tc_setup_cb_call(block, NULL, TC_SETUP_CLSU32, &cls_u32, skip_sw);
 587         if (err < 0) {
 588                 u32_remove_hw_knode(tp, n, NULL);
 589                 return err;
 590         } else if (err > 0) {
 591                 tcf_block_offload_inc(block, &n->flags);
 592         }
 593
 594         if (skip_sw && !(n->flags & TCA_CLS_FLAGS_IN_HW))
 595                 return -EINVAL;
 596
 597         return 0;
 598 }
 599
 600 static void u32_clear_hnode(struct tcf_proto *tp, struct tc_u_hnode *ht,
 601                             struct netlink_ext_ack *extack)
 602 {
 603         struct tc_u_knode *n;
 604         unsigned int h;
 605
 606         for (h = 0; h <= ht->divisor; h++) {
 607                 while ((n = rtnl_dereference(ht->ht[h])) != NULL) {
 608                         RCU_INIT_POINTER(ht->ht[h],
 609                                          rtnl_dereference(n->next));
 610                         tcf_unbind_filter(tp, &n->res);
 611                         u32_remove_hw_knode(tp, n, extack);
 612                         idr_remove(&ht->handle_idr, n->handle);
 613                         if (tcf_exts_get_net(&n->exts))
 614                                 call_rcu(&n->rcu, u32_delete_key_freepf_rcu);
 615                         else
 616                                 u32_destroy_key(n->tp, n, true);
 617                 }
 618         }
 619 }
 620
 621 static int u32_destroy_hnode(struct tcf_proto *tp, struct tc_u_hnode *ht,
 622                              struct netlink_ext_ack *extack)
 623 {
 624         struct tc_u_common *tp_c = tp->data;
 625         struct tc_u_hnode __rcu **hn;
 626         struct tc_u_hnode *phn;
 627
 628         WARN_ON(ht->refcnt);
 629
 630         u32_clear_hnode(tp, ht, extack);
 631
 632         hn = &tp_c->hlist;
 633         for (phn = rtnl_dereference(*hn);
 634              phn;
 635              hn = &phn->next, phn = rtnl_dereference(*hn)) {
 636                 if (phn == ht) {
 637                         u32_clear_hw_hnode(tp, ht, extack);
 638                         idr_destroy(&ht->handle_idr);
 639                         idr_remove(&tp_c->handle_idr, ht->handle);
 640                         RCU_INIT_POINTER(*hn, ht->next);
 641                         kfree_rcu(ht, rcu);
 642                         return 0;
 643                 }
 644         }
 645
 646         return -ENOENT;
 647 }
 648
 649 static bool ht_empty(struct tc_u_hnode *ht)
 650 {
 651         unsigned int h;
 652
 653         for (h = 0; h <= ht->divisor; h++)
 654                 if (rcu_access_pointer(ht->ht[h]))
 655                         return false;
 656
 657         return true;
 658 }
 659
 660 static void u32_destroy(struct tcf_proto *tp, struct netlink_ext_ack *extack)
 661 {
 662         struct tc_u_common *tp_c = tp->data;
 663         struct tc_u_hnode *root_ht = rtnl_dereference(tp->root);
 664
 665         WARN_ON(root_ht == NULL);
 666
 667         if (root_ht && --root_ht->refcnt == 0)
 668                 u32_destroy_hnode(tp, root_ht, extack);
 669
 670         if (--tp_c->refcnt == 0) {
 671                 struct tc_u_hnode *ht;
 672
 673                 hlist_del(&tp_c->hnode);
 674
 675                 while ((ht = rtnl_dereference(tp_c->hlist)) != NULL) {
 676                         u32_clear_hnode(tp, ht, extack);
 677                         RCU_INIT_POINTER(tp_c->hlist, ht->next);
 678
 679                         /* u32_destroy_key() will later free ht for us, if it's
 680                          * still referenced by some knode
 681                          */
 682                         if (--ht->refcnt == 0)
 683                                 kfree_rcu(ht, rcu);
 684                 }
 685
 686                 idr_destroy(&tp_c->handle_idr);
 687                 kfree(tp_c);
 688         }
 689
 690         tp->data = NULL;
 691 }
 692
 693 static int u32_delete(struct tcf_proto *tp, void *arg, bool *last,
 694                       struct netlink_ext_ack *extack)
 695 {
 696         struct tc_u_hnode *ht = arg;
 697         struct tc_u_hnode *root_ht = rtnl_dereference(tp->root);
 698         struct tc_u_common *tp_c = tp->data;
 699         int ret = 0;
 700
 701         if (ht == NULL)
 702                 goto out;
 703
 704         if (TC_U32_KEY(ht->handle)) {
 705                 u32_remove_hw_knode(tp, (struct tc_u_knode *)ht, extack);
 706                 ret = u32_delete_key(tp, (struct tc_u_knode *)ht);
 707                 goto out;
 708         }
 709
 710         if (root_ht == ht) {
 711                 NL_SET_ERR_MSG_MOD(extack, "Not allowed to delete root node");
 712                 return -EINVAL;
 713         }
 714
 715         if (ht->refcnt == 1) {
 716                 ht->refcnt--;
 717                 u32_destroy_hnode(tp, ht, extack);
 718         } else {
 719                 NL_SET_ERR_MSG_MOD(extack, "Can not delete in-use filter");
 720                 return -EBUSY;
 721         }
 722
 723 out:
 724         *last = true;
 725         if (root_ht) {
 726                 if (root_ht->refcnt > 1) {
 727                         *last = false;
 728                         goto ret;
 729                 }
 730                 if (root_ht->refcnt == 1) {
 731                         if (!ht_empty(root_ht)) {
 732                                 *last = false;
 733                                 goto ret;
 734                         }
 735                 }
 736         }
 737
 738         if (tp_c->refcnt > 1) {
 739                 *last = false;
 740                 goto ret;
 741         }
 742
 743         if (tp_c->refcnt == 1) {
 744                 struct tc_u_hnode *ht;
 745
 746                 for (ht = rtnl_dereference(tp_c->hlist);
 747                      ht;
 748                      ht = rtnl_dereference(ht->next))
 749                         if (!ht_empty(ht)) {
 750                                 *last = false;
 751                                 break;
 752                         }
 753         }
 754
 755 ret:
 756         return ret;
 757 }
 758
 759 static u32 gen_new_kid(struct tc_u_hnode *ht, u32 htid)
 760 {
 761         u32 index = htid | 0x800;
 762         u32 max = htid | 0xFFF;
 763
 764         if (idr_alloc_u32(&ht->handle_idr, NULL, &index, max, GFP_KERNEL)) {
 765                 index = htid + 1;
 766                 if (idr_alloc_u32(&ht->handle_idr, NULL, &index, max,
 767                                  GFP_KERNEL))
 768                         index = max;
 769         }
 770
 771         return index;
 772 }
 773
 774 static const struct nla_policy u32_policy[TCA_U32_MAX + 1] = {
 775         [TCA_U32_CLASSID]       = { .type = NLA_U32 },
 776         [TCA_U32_HASH]          = { .type = NLA_U32 },
 777         [TCA_U32_LINK]          = { .type = NLA_U32 },
 778         [TCA_U32_DIVISOR]       = { .type = NLA_U32 },
 779         [TCA_U32_SEL]           = { .len = sizeof(struct tc_u32_sel) },
 780         [TCA_U32_INDEV]         = { .type = NLA_STRING, .len = IFNAMSIZ },
 781         [TCA_U32_MARK]          = { .len = sizeof(struct tc_u32_mark) },
 782         [TCA_U32_FLAGS]         = { .type = NLA_U32 },
 783 };
 784
 785 static int u32_set_parms(struct net *net, struct tcf_proto *tp,
 786                          unsigned long base, struct tc_u_hnode *ht,
 787                          struct tc_u_knode *n, struct nlattr **tb,
 788                          struct nlattr *est, bool ovr,
 789                          struct netlink_ext_ack *extack)
 790 {
 791         int err;
 792
 793         err = tcf_exts_validate(net, tp, tb, est, &n->exts, ovr, extack);
 794         if (err < 0)
 795                 return err;
 796
 797         if (tb[TCA_U32_LINK]) {
 798                 u32 handle = nla_get_u32(tb[TCA_U32_LINK]);
 799                 struct tc_u_hnode *ht_down = NULL, *ht_old;
 800
 801                 if (TC_U32_KEY(handle)) {
 802                         NL_SET_ERR_MSG_MOD(extack, "u32 Link handle must be a hash table");
 803                         return -EINVAL;
 804                 }
 805
 806                 if (handle) {
 807                         ht_down = u32_lookup_ht(ht->tp_c, handle);
 808
 809                         if (!ht_down) {
 810                                 NL_SET_ERR_MSG_MOD(extack, "Link hash table not found");
 811                                 return -EINVAL;
 812                         }
 813                         ht_down->refcnt++;
 814                 }
 815
 816                 ht_old = rtnl_dereference(n->ht_down);
 817                 rcu_assign_pointer(n->ht_down, ht_down);
 818
 819                 if (ht_old)
 820                         ht_old->refcnt--;
 821         }
 822         if (tb[TCA_U32_CLASSID]) {
 823                 n->res.classid = nla_get_u32(tb[TCA_U32_CLASSID]);
 824                 tcf_bind_filter(tp, &n->res, base);
 825         }
 826
 827 #ifdef CONFIG_NET_CLS_IND
 828         if (tb[TCA_U32_INDEV]) {
 829                 int ret;
 830                 ret = tcf_change_indev(net, tb[TCA_U32_INDEV], extack);
 831                 if (ret < 0)
 832                         return -EINVAL;
 833                 n->ifindex = ret;
 834         }
 835 #endif
 836         return 0;
 837 }
 838
 839 static void u32_replace_knode(struct tcf_proto *tp, struct tc_u_common *tp_c,
 840                               struct tc_u_knode *n)
 841 {
 842         struct tc_u_knode __rcu **ins;
 843         struct tc_u_knode *pins;
 844         struct tc_u_hnode *ht;
 845
 846         if (TC_U32_HTID(n->handle) == TC_U32_ROOT)
 847                 ht = rtnl_dereference(tp->root);
 848         else
 849                 ht = u32_lookup_ht(tp_c, TC_U32_HTID(n->handle));
 850
 851         ins = &ht->ht[TC_U32_HASH(n->handle)];
 852
 853         /* The node must always exist for it to be replaced if this is not the
 854          * case then something went very wrong elsewhere.
 855          */
 856         for (pins = rtnl_dereference(*ins); ;
 857              ins = &pins->next, pins = rtnl_dereference(*ins))
 858                 if (pins->handle == n->handle)
 859                         break;
 860
 861         idr_replace(&ht->handle_idr, n, n->handle);
 862         RCU_INIT_POINTER(n->next, pins->next);
 863         rcu_assign_pointer(*ins, n);
 864 }
 865
 866 static struct tc_u_knode *u32_init_knode(struct tcf_proto *tp,
 867                                          struct tc_u_knode *n)
 868 {
 869         struct tc_u_hnode *ht = rtnl_dereference(n->ht_down);
 870         struct tc_u32_sel *s = &n->sel;
 871         struct tc_u_knode *new;
 872
 873         new = kzalloc(sizeof(*n) + s->nkeys*sizeof(struct tc_u32_key),
 874                       GFP_KERNEL);
 875
 876         if (!new)
 877                 return NULL;
 878
 879         RCU_INIT_POINTER(new->next, n->next);
 880         new->handle = n->handle;
 881         RCU_INIT_POINTER(new->ht_up, n->ht_up);
 882
 883 #ifdef CONFIG_NET_CLS_IND
 884         new->ifindex = n->ifindex;
 885 #endif
 886         new->fshift = n->fshift;
 887         new->res = n->res;
 888         new->flags = n->flags;
 889         RCU_INIT_POINTER(new->ht_down, ht);
 890
 891         /* bump reference count as long as we hold pointer to structure */
 892         if (ht)
 893                 ht->refcnt++;
 894
 895 #ifdef CONFIG_CLS_U32_PERF
 896         /* Statistics may be incremented by readers during update
 897          * so we must keep them in tact. When the node is later destroyed
 898          * a special destroy call must be made to not free the pf memory.
 899          */
 900         new->pf = n->pf;
 901 #endif
 902
 903 #ifdef CONFIG_CLS_U32_MARK
 904         new->val = n->val;
 905         new->mask = n->mask;
 906         /* Similarly success statistics must be moved as pointers */
 907         new->pcpu_success = n->pcpu_success;
 908 #endif
 909         new->tp = tp;
 910         memcpy(&new->sel, s, sizeof(*s) + s->nkeys*sizeof(struct tc_u32_key));
 911
 912         if (tcf_exts_init(&new->exts, TCA_U32_ACT, TCA_U32_POLICE)) {
 913                 kfree(new);
 914                 return NULL;
 915         }
 916
 917         return new;
 918 }
 919
 920 static int u32_change(struct net *net, struct sk_buff *in_skb,
 921                       struct tcf_proto *tp, unsigned long base, u32 handle,
 922                       struct nlattr **tca, void **arg, bool ovr,
 923                       struct netlink_ext_ack *extack)
 924 {
 925         struct tc_u_common *tp_c = tp->data;
 926         struct tc_u_hnode *ht;
 927         struct tc_u_knode *n;
 928         struct tc_u32_sel *s;
 929         struct nlattr *opt = tca[TCA_OPTIONS];
 930         struct nlattr *tb[TCA_U32_MAX + 1];
 931         u32 htid, flags = 0;
 932         int err;
 933 #ifdef CONFIG_CLS_U32_PERF
 934         size_t size;
 935 #endif
 936
 937         if (!opt) {
 938                 if (handle) {
 939                         NL_SET_ERR_MSG_MOD(extack, "Filter handle requires options");
 940                         return -EINVAL;
 941                 } else {
 942                         return 0;
 943                 }
 944         }
 945
 946         err = nla_parse_nested(tb, TCA_U32_MAX, opt, u32_policy, extack);
 947         if (err < 0)
 948                 return err;
 949
 950         if (tb[TCA_U32_FLAGS]) {
 951                 flags = nla_get_u32(tb[TCA_U32_FLAGS]);
 952                 if (!tc_flags_valid(flags)) {
 953                         NL_SET_ERR_MSG_MOD(extack, "Invalid filter flags");
 954                         return -EINVAL;
 955                 }
 956         }
 957
 958         n = *arg;
 959         if (n) {
 960                 struct tc_u_knode *new;
 961
 962                 if (TC_U32_KEY(n->handle) == 0) {
 963                         NL_SET_ERR_MSG_MOD(extack, "Key node id cannot be zero");
 964                         return -EINVAL;
 965                 }
 966
 967                 if ((n->flags ^ flags) &
 968                     ~(TCA_CLS_FLAGS_IN_HW | TCA_CLS_FLAGS_NOT_IN_HW)) {
 969                         NL_SET_ERR_MSG_MOD(extack, "Key node flags do not match passed flags");
 970                         return -EINVAL;
 971                 }
 972
 973                 new = u32_init_knode(tp, n);
 974                 if (!new)
 975                         return -ENOMEM;
 976
 977                 err = u32_set_parms(net, tp, base,
 978                                     rtnl_dereference(n->ht_up), new, tb,
 979                                     tca[TCA_RATE], ovr, extack);
 980
 981                 if (err) {
 982                         u32_destroy_key(tp, new, false);
 983                         return err;
 984                 }
 985
 986                 err = u32_replace_hw_knode(tp, new, flags, extack);
 987                 if (err) {
 988                         u32_destroy_key(tp, new, false);
 989                         return err;
 990                 }
 991
 992                 if (!tc_in_hw(new->flags))
 993                         new->flags |= TCA_CLS_FLAGS_NOT_IN_HW;
 994
 995                 u32_replace_knode(tp, tp_c, new);
 996                 tcf_unbind_filter(tp, &n->res);
 997                 tcf_exts_get_net(&n->exts);
 998                 call_rcu(&n->rcu, u32_delete_key_rcu);
 999                 return 0;
1000         }
1001
1002         if (tb[TCA_U32_DIVISOR]) {
1003                 unsigned int divisor = nla_get_u32(tb[TCA_U32_DIVISOR]);
1004
1005                 if (--divisor > 0x100) {
1006                         NL_SET_ERR_MSG_MOD(extack, "Exceeded maximum 256 hash buckets");
1007                         return -EINVAL;
1008                 }
1009                 if (TC_U32_KEY(handle)) {
1010                         NL_SET_ERR_MSG_MOD(extack, "Divisor can only be used on a hash table");
1011                         return -EINVAL;
1012                 }
1013                 ht = kzalloc(sizeof(*ht) + divisor*sizeof(void *), GFP_KERNEL);
1014                 if (ht == NULL)
1015                         return -ENOBUFS;
1016                 if (handle == 0) {
1017                         handle = gen_new_htid(tp->data, ht);
1018                         if (handle == 0) {
1019                                 kfree(ht);
1020                                 return -ENOMEM;
1021                         }
1022                 } else {
1023                         err = idr_alloc_u32(&tp_c->handle_idr, ht, &handle,
1024                                             handle, GFP_KERNEL);
1025                         if (err) {
1026                                 kfree(ht);
1027                                 return err;
1028                         }
1029                 }
1030                 ht->tp_c = tp_c;
1031                 ht->refcnt = 1;
1032                 ht->divisor = divisor;
1033                 ht->handle = handle;
1034                 ht->prio = tp->prio;
1035                 idr_init(&ht->handle_idr);
1036                 ht->flags = flags;
1037
1038                 err = u32_replace_hw_hnode(tp, ht, flags, extack);
1039                 if (err) {
1040                         idr_remove(&tp_c->handle_idr, handle);
1041                         kfree(ht);
1042                         return err;
1043                 }
1044
1045                 RCU_INIT_POINTER(ht->next, tp_c->hlist);
1046                 rcu_assign_pointer(tp_c->hlist, ht);
1047                 *arg = ht;
1048
1049                 return 0;
1050         }
1051
1052         if (tb[TCA_U32_HASH]) {
1053                 htid = nla_get_u32(tb[TCA_U32_HASH]);
1054                 if (TC_U32_HTID(htid) == TC_U32_ROOT) {
1055                         ht = rtnl_dereference(tp->root);
1056                         htid = ht->handle;
1057                 } else {
1058                         ht = u32_lookup_ht(tp->data, TC_U32_HTID(htid));
1059                         if (!ht) {
1060                                 NL_SET_ERR_MSG_MOD(extack, "Specified hash table not found");
1061                                 return -EINVAL;
1062                         }
1063                 }
1064         } else {
1065                 ht = rtnl_dereference(tp->root);
1066                 htid = ht->handle;
1067         }
1068
1069         if (ht->divisor < TC_U32_HASH(htid)) {
1070                 NL_SET_ERR_MSG_MOD(extack, "Specified hash table buckets exceed configured value");
1071                 return -EINVAL;
1072         }
1073
1074         if (handle) {
1075                 if (TC_U32_HTID(handle) && TC_U32_HTID(handle ^ htid)) {
1076                         NL_SET_ERR_MSG_MOD(extack, "Handle specified hash table address mismatch");
1077                         return -EINVAL;
1078                 }
1079                 handle = htid | TC_U32_NODE(handle);
1080                 err = idr_alloc_u32(&ht->handle_idr, NULL, &handle, handle,
1081                                     GFP_KERNEL);
1082                 if (err)
1083                         return err;
1084         } else
1085                 handle = gen_new_kid(ht, htid);
1086
1087         if (tb[TCA_U32_SEL] == NULL) {
1088                 NL_SET_ERR_MSG_MOD(extack, "Selector not specified");
1089                 err = -EINVAL;
1090                 goto erridr;
1091         }
1092
1093         s = nla_data(tb[TCA_U32_SEL]);
1094
1095         n = kzalloc(sizeof(*n) + s->nkeys*sizeof(struct tc_u32_key), GFP_KERNEL);
1096         if (n == NULL) {
1097                 err = -ENOBUFS;
1098                 goto erridr;
1099         }
1100
1101 #ifdef CONFIG_CLS_U32_PERF
1102         size = sizeof(struct tc_u32_pcnt) + s->nkeys * sizeof(u64);
1103         n->pf = __alloc_percpu(size, __alignof__(struct tc_u32_pcnt));
1104         if (!n->pf) {
1105                 err = -ENOBUFS;
1106                 goto errfree;
1107         }
1108 #endif
1109
1110         memcpy(&n->sel, s, sizeof(*s) + s->nkeys*sizeof(struct tc_u32_key));
1111         RCU_INIT_POINTER(n->ht_up, ht);
1112         n->handle = handle;
1113         n->fshift = s->hmask ? ffs(ntohl(s->hmask)) - 1 : 0;
1114         n->flags = flags;
1115         n->tp = tp;
1116
1117         err = tcf_exts_init(&n->exts, TCA_U32_ACT, TCA_U32_POLICE);
1118         if (err < 0)
1119                 goto errout;
1120
1121 #ifdef CONFIG_CLS_U32_MARK
1122         n->pcpu_success = alloc_percpu(u32);
1123         if (!n->pcpu_success) {
1124                 err = -ENOMEM;
1125                 goto errout;
1126         }
1127
1128         if (tb[TCA_U32_MARK]) {
1129                 struct tc_u32_mark *mark;
1130
1131                 mark = nla_data(tb[TCA_U32_MARK]);
1132                 n->val = mark->val;
1133                 n->mask = mark->mask;
1134         }
1135 #endif
1136
1137         err = u32_set_parms(net, tp, base, ht, n, tb, tca[TCA_RATE], ovr,
1138                             extack);
1139         if (err == 0) {
1140                 struct tc_u_knode __rcu **ins;
1141                 struct tc_u_knode *pins;
1142
1143                 err = u32_replace_hw_knode(tp, n, flags, extack);
1144                 if (err)
1145                         goto errhw;
1146
1147                 if (!tc_in_hw(n->flags))
1148                         n->flags |= TCA_CLS_FLAGS_NOT_IN_HW;
1149
1150                 ins = &ht->ht[TC_U32_HASH(handle)];
1151                 for (pins = rtnl_dereference(*ins); pins;
1152                      ins = &pins->next, pins = rtnl_dereference(*ins))
1153                         if (TC_U32_NODE(handle) < TC_U32_NODE(pins->handle))
1154                                 break;
1155
1156                 RCU_INIT_POINTER(n->next, pins);
1157                 rcu_assign_pointer(*ins, n);
1158                 *arg = n;
1159                 return 0;
1160         }
1161
1162 errhw:
1163 #ifdef CONFIG_CLS_U32_MARK
1164         free_percpu(n->pcpu_success);
1165 #endif
1166
1167 errout:
1168         tcf_exts_destroy(&n->exts);
1169 #ifdef CONFIG_CLS_U32_PERF
1170 errfree:
1171         free_percpu(n->pf);
1172 #endif
1173         kfree(n);
1174 erridr:
1175         idr_remove(&ht->handle_idr, handle);
1176         return err;
1177 }
1178
1179 static void u32_walk(struct tcf_proto *tp, struct tcf_walker *arg)
1180 {
1181         struct tc_u_common *tp_c = tp->data;
1182         struct tc_u_hnode *ht;
1183         struct tc_u_knode *n;
1184         unsigned int h;
1185
1186         if (arg->stop)
1187                 return;
1188
1189         for (ht = rtnl_dereference(tp_c->hlist);
1190              ht;
1191              ht = rtnl_dereference(ht->next)) {
1192                 if (ht->prio != tp->prio)
1193                         continue;
1194                 if (arg->count >= arg->skip) {
1195                         if (arg->fn(tp, ht, arg) < 0) {
1196                                 arg->stop = 1;
1197                                 return;
1198                         }
1199                 }
1200                 arg->count++;
1201                 for (h = 0; h <= ht->divisor; h++) {
1202                         for (n = rtnl_dereference(ht->ht[h]);
1203                              n;
1204                              n = rtnl_dereference(n->next)) {
1205                                 if (arg->count < arg->skip) {
1206                                         arg->count++;
1207                                         continue;
1208                                 }
1209                                 if (arg->fn(tp, n, arg) < 0) {
1210                                         arg->stop = 1;
1211                                         return;
1212                                 }
1213                                 arg->count++;
1214                         }
1215                 }
1216         }
1217 }
1218
1219 static void u32_bind_class(void *fh, u32 classid, unsigned long cl)
1220 {
1221         struct tc_u_knode *n = fh;
1222
1223         if (n && n->res.classid == classid)
1224                 n->res.class = cl;
1225 }
1226
1227 static int u32_dump(struct net *net, struct tcf_proto *tp, void *fh,
1228                     struct sk_buff *skb, struct tcmsg *t)
1229 {
1230         struct tc_u_knode *n = fh;
1231         struct tc_u_hnode *ht_up, *ht_down;
1232         struct nlattr *nest;
1233
1234         if (n == NULL)
1235                 return skb->len;
1236
1237         t->tcm_handle = n->handle;
1238
1239         nest = nla_nest_start(skb, TCA_OPTIONS);
1240         if (nest == NULL)
1241                 goto nla_put_failure;
1242
1243         if (TC_U32_KEY(n->handle) == 0) {
1244                 struct tc_u_hnode *ht = fh;
1245                 u32 divisor = ht->divisor + 1;
1246
1247                 if (nla_put_u32(skb, TCA_U32_DIVISOR, divisor))
1248                         goto nla_put_failure;
1249         } else {
1250 #ifdef CONFIG_CLS_U32_PERF
1251                 struct tc_u32_pcnt *gpf;
1252                 int cpu;
1253 #endif
1254
1255                 if (nla_put(skb, TCA_U32_SEL,
1256                             sizeof(n->sel) + n->sel.nkeys*sizeof(struct tc_u32_key),
1257                             &n->sel))
1258                         goto nla_put_failure;
1259
1260                 ht_up = rtnl_dereference(n->ht_up);
1261                 if (ht_up) {
1262                         u32 htid = n->handle & 0xFFFFF000;
1263                         if (nla_put_u32(skb, TCA_U32_HASH, htid))
1264                                 goto nla_put_failure;
1265                 }
1266                 if (n->res.classid &&
1267                     nla_put_u32(skb, TCA_U32_CLASSID, n->res.classid))
1268                         goto nla_put_failure;
1269
1270                 ht_down = rtnl_dereference(n->ht_down);
1271                 if (ht_down &&
1272                     nla_put_u32(skb, TCA_U32_LINK, ht_down->handle))
1273                         goto nla_put_failure;
1274
1275                 if (n->flags && nla_put_u32(skb, TCA_U32_FLAGS, n->flags))
1276                         goto nla_put_failure;
1277
1278 #ifdef CONFIG_CLS_U32_MARK
1279                 if ((n->val || n->mask)) {
1280                         struct tc_u32_mark mark = {.val = n->val,
1281                                                    .mask = n->mask,
1282                                                    .success = 0};
1283                         int cpum;
1284
1285                         for_each_possible_cpu(cpum) {
1286                                 __u32 cnt = *per_cpu_ptr(n->pcpu_success, cpum);
1287
1288                                 mark.success += cnt;
1289                         }
1290
1291                         if (nla_put(skb, TCA_U32_MARK, sizeof(mark), &mark))
1292                                 goto nla_put_failure;
1293                 }
1294 #endif
1295
1296                 if (tcf_exts_dump(skb, &n->exts) < 0)
1297                         goto nla_put_failure;
1298
1299 #ifdef CONFIG_NET_CLS_IND
1300                 if (n->ifindex) {
1301                         struct net_device *dev;
1302                         dev = __dev_get_by_index(net, n->ifindex);
1303                         if (dev && nla_put_string(skb, TCA_U32_INDEV, dev->name))
1304                                 goto nla_put_failure;
1305                 }
1306 #endif
1307 #ifdef CONFIG_CLS_U32_PERF
1308                 gpf = kzalloc(sizeof(struct tc_u32_pcnt) +
1309                               n->sel.nkeys * sizeof(u64),
1310                               GFP_KERNEL);
1311                 if (!gpf)
1312                         goto nla_put_failure;
1313
1314                 for_each_possible_cpu(cpu) {
1315                         int i;
1316                         struct tc_u32_pcnt *pf = per_cpu_ptr(n->pf, cpu);
1317
1318                         gpf->rcnt += pf->rcnt;
1319                         gpf->rhit += pf->rhit;
1320                         for (i = 0; i < n->sel.nkeys; i++)
1321                                 gpf->kcnts[i] += pf->kcnts[i];
1322                 }
1323
1324                 if (nla_put_64bit(skb, TCA_U32_PCNT,
1325                                   sizeof(struct tc_u32_pcnt) +
1326                                   n->sel.nkeys * sizeof(u64),
1327                                   gpf, TCA_U32_PAD)) {
1328                         kfree(gpf);
1329                         goto nla_put_failure;
1330                 }
1331                 kfree(gpf);
1332 #endif
1333         }
1334
1335         nla_nest_end(skb, nest);
1336
1337         if (TC_U32_KEY(n->handle))
1338                 if (tcf_exts_dump_stats(skb, &n->exts) < 0)
1339                         goto nla_put_failure;
1340         return skb->len;
1341
1342 nla_put_failure:
1343         nla_nest_cancel(skb, nest);
1344         return -1;
1345 }
1346
1347 static struct tcf_proto_ops cls_u32_ops __read_mostly = {
1348         .kind           =       "u32",
1349         .classify       =       u32_classify,
1350         .init           =       u32_init,
1351         .destroy        =       u32_destroy,
1352         .get            =       u32_get,
1353         .change         =       u32_change,
1354         .delete         =       u32_delete,
1355         .walk           =       u32_walk,
1356         .dump           =       u32_dump,
1357         .bind_class     =       u32_bind_class,
1358         .owner          =       THIS_MODULE,
1359 };
1360
1361 static int __init init_u32(void)
1362 {
1363         int i, ret;
1364
1365         pr_info("u32 classifier\n");
1366 #ifdef CONFIG_CLS_U32_PERF
1367         pr_info("    Performance counters on\n");
1368 #endif
1369 #ifdef CONFIG_NET_CLS_IND
1370         pr_info("    input device check on\n");
1371 #endif
1372 #ifdef CONFIG_NET_CLS_ACT
1373         pr_info("    Actions configured\n");
1374 #endif
1375         tc_u_common_hash = kvmalloc_array(U32_HASH_SIZE,
1376                                           sizeof(struct hlist_head),
1377                                           GFP_KERNEL);
1378         if (!tc_u_common_hash)
1379                 return -ENOMEM;
1380
1381         for (i = 0; i < U32_HASH_SIZE; i++)
1382                 INIT_HLIST_HEAD(&tc_u_common_hash[i]);
1383
1384         ret = register_tcf_proto_ops(&cls_u32_ops);
1385         if (ret)
1386                 kvfree(tc_u_common_hash);
1387         return ret;
1388 }
1389
1390 static void __exit exit_u32(void)
1391 {
1392         unregister_tcf_proto_ops(&cls_u32_ops);
1393         kvfree(tc_u_common_hash);
1394 }
1395
1396 module_init(init_u32)
1397 module_exit(exit_u32)
1398 MODULE_LICENSE("GPL");