net/sched/cls_u32.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * net/sched/cls_u32.c  Ugly (or Universal) 32bit key Packet Classifier.
   4  *
   5  * Authors:     Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
   6  *
   7  *      The filters are packed to hash tables of key nodes
   8  *      with a set of 32bit key/mask pairs at every node.
   9  *      Nodes reference next level hash tables etc.
  10  *
  11  *      This scheme is the best universal classifier I managed to
  12  *      invent; it is not super-fast, but it is not slow (provided you
  13  *      program it correctly), and general enough.  And its relative
  14  *      speed grows as the number of rules becomes larger.
  15  *
  16  *      It seems that it represents the best middle point between
  17  *      speed and manageability both by human and by machine.
  18  *
  19  *      It is especially useful for link sharing combined with QoS;
  20  *      pure RSVP doesn't need such a general approach and can use
  21  *      much simpler (and faster) schemes, sort of cls_rsvp.c.
  22  *
  23  *      nfmark match added by Catalin(ux aka Dino) BOIE <catab at umbrella.ro>
  24  */
  25
  26 #include <linux/module.h>
  27 #include <linux/slab.h>
  28 #include <linux/types.h>
  29 #include <linux/kernel.h>
  30 #include <linux/string.h>
  31 #include <linux/errno.h>
  32 #include <linux/percpu.h>
  33 #include <linux/rtnetlink.h>
  34 #include <linux/skbuff.h>
  35 #include <linux/bitmap.h>
  36 #include <linux/netdevice.h>
  37 #include <linux/hash.h>
  38 #include <net/netlink.h>
  39 #include <net/act_api.h>
  40 #include <net/pkt_cls.h>
  41 #include <linux/idr.h>
  42
  43 struct tc_u_knode {
  44         struct tc_u_knode __rcu *next;
  45         u32                     handle;
  46         struct tc_u_hnode __rcu *ht_up;
  47         struct tcf_exts         exts;
  48         int                     ifindex;
  49         u8                      fshift;
  50         struct tcf_result       res;
  51         struct tc_u_hnode __rcu *ht_down;
  52 #ifdef CONFIG_CLS_U32_PERF
  53         struct tc_u32_pcnt __percpu *pf;
  54 #endif
  55         u32                     flags;
  56         unsigned int            in_hw_count;
  57 #ifdef CONFIG_CLS_U32_MARK
  58         u32                     val;
  59         u32                     mask;
  60         u32 __percpu            *pcpu_success;
  61 #endif
  62         struct rcu_work         rwork;
  63         /* The 'sel' field MUST be the last field in structure to allow for
  64          * tc_u32_keys allocated at end of structure.
  65          */
  66         struct tc_u32_sel       sel;
  67 };
  68
  69 struct tc_u_hnode {
  70         struct tc_u_hnode __rcu *next;
  71         u32                     handle;
  72         u32                     prio;
  73         int                     refcnt;
  74         unsigned int            divisor;
  75         struct idr              handle_idr;
  76         bool                    is_root;
  77         struct rcu_head         rcu;
  78         u32                     flags;
  79         /* The 'ht' field MUST be the last field in structure to allow for
  80          * more entries allocated at end of structure.
  81          */
  82         struct tc_u_knode __rcu *ht[];
  83 };
  84
  85 struct tc_u_common {
  86         struct tc_u_hnode __rcu *hlist;
  87         void                    *ptr;
  88         int                     refcnt;
  89         struct idr              handle_idr;
  90         struct hlist_node       hnode;
  91         long                    knodes;
  92 };
  93
  94 static inline unsigned int u32_hash_fold(__be32 key,
  95                                          const struct tc_u32_sel *sel,
  96                                          u8 fshift)
  97 {
  98         unsigned int h = ntohl(key & sel->hmask) >> fshift;
  99
 100         return h;
 101 }
 102
 103 static int u32_classify(struct sk_buff *skb, const struct tcf_proto *tp,
 104                         struct tcf_result *res)
 105 {
 106         struct {
 107                 struct tc_u_knode *knode;
 108                 unsigned int      off;
 109         } stack[TC_U32_MAXDEPTH];
 110
 111         struct tc_u_hnode *ht = rcu_dereference_bh(tp->root);
 112         unsigned int off = skb_network_offset(skb);
 113         struct tc_u_knode *n;
 114         int sdepth = 0;
 115         int off2 = 0;
 116         int sel = 0;
 117 #ifdef CONFIG_CLS_U32_PERF
 118         int j;
 119 #endif
 120         int i, r;
 121
 122 next_ht:
 123         n = rcu_dereference_bh(ht->ht[sel]);
 124
 125 next_knode:
 126         if (n) {
 127                 struct tc_u32_key *key = n->sel.keys;
 128
 129 #ifdef CONFIG_CLS_U32_PERF
 130                 __this_cpu_inc(n->pf->rcnt);
 131                 j = 0;
 132 #endif
 133
 134                 if (tc_skip_sw(n->flags)) {
 135                         n = rcu_dereference_bh(n->next);
 136                         goto next_knode;
 137                 }
 138
 139 #ifdef CONFIG_CLS_U32_MARK
 140                 if ((skb->mark & n->mask) != n->val) {
 141                         n = rcu_dereference_bh(n->next);
 142                         goto next_knode;
 143                 } else {
 144                         __this_cpu_inc(*n->pcpu_success);
 145                 }
 146 #endif
 147
 148                 for (i = n->sel.nkeys; i > 0; i--, key++) {
 149                         int toff = off + key->off + (off2 & key->offmask);
 150                         __be32 *data, hdata;
 151
 152                         if (skb_headroom(skb) + toff > INT_MAX)
 153                                 goto out;
 154
 155                         data = skb_header_pointer(skb, toff, 4, &hdata);
 156                         if (!data)
 157                                 goto out;
 158                         if ((*data ^ key->val) & key->mask) {
 159                                 n = rcu_dereference_bh(n->next);
 160                                 goto next_knode;
 161                         }
 162 #ifdef CONFIG_CLS_U32_PERF
 163                         __this_cpu_inc(n->pf->kcnts[j]);
 164                         j++;
 165 #endif
 166                 }
 167
 168                 ht = rcu_dereference_bh(n->ht_down);
 169                 if (!ht) {
 170 check_terminal:
 171                         if (n->sel.flags & TC_U32_TERMINAL) {
 172
 173                                 *res = n->res;
 174                                 if (!tcf_match_indev(skb, n->ifindex)) {
 175                                         n = rcu_dereference_bh(n->next);
 176                                         goto next_knode;
 177                                 }
 178 #ifdef CONFIG_CLS_U32_PERF
 179                                 __this_cpu_inc(n->pf->rhit);
 180 #endif
 181                                 r = tcf_exts_exec(skb, &n->exts, res);
 182                                 if (r < 0) {
 183                                         n = rcu_dereference_bh(n->next);
 184                                         goto next_knode;
 185                                 }
 186
 187                                 return r;
 188                         }
 189                         n = rcu_dereference_bh(n->next);
 190                         goto next_knode;
 191                 }
 192
 193                 /* PUSH */
 194                 if (sdepth >= TC_U32_MAXDEPTH)
 195                         goto deadloop;
 196                 stack[sdepth].knode = n;
 197                 stack[sdepth].off = off;
 198                 sdepth++;
 199
 200                 ht = rcu_dereference_bh(n->ht_down);
 201                 sel = 0;
 202                 if (ht->divisor) {
 203                         __be32 *data, hdata;
 204
 205                         data = skb_header_pointer(skb, off + n->sel.hoff, 4,
 206                                                   &hdata);
 207                         if (!data)
 208                                 goto out;
 209                         sel = ht->divisor & u32_hash_fold(*data, &n->sel,
 210                                                           n->fshift);
 211                 }
 212                 if (!(n->sel.flags & (TC_U32_VAROFFSET | TC_U32_OFFSET | TC_U32_EAT)))
 213                         goto next_ht;
 214
 215                 if (n->sel.flags & (TC_U32_OFFSET | TC_U32_VAROFFSET)) {
 216                         off2 = n->sel.off + 3;
 217                         if (n->sel.flags & TC_U32_VAROFFSET) {
 218                                 __be16 *data, hdata;
 219
 220                                 data = skb_header_pointer(skb,
 221                                                           off + n->sel.offoff,
 222                                                           2, &hdata);
 223                                 if (!data)
 224                                         goto out;
 225                                 off2 += ntohs(n->sel.offmask & *data) >>
 226                                         n->sel.offshift;
 227                         }
 228                         off2 &= ~3;
 229                 }
 230                 if (n->sel.flags & TC_U32_EAT) {
 231                         off += off2;
 232                         off2 = 0;
 233                 }
 234
 235                 if (off < skb->len)
 236                         goto next_ht;
 237         }
 238
 239         /* POP */
 240         if (sdepth--) {
 241                 n = stack[sdepth].knode;
 242                 ht = rcu_dereference_bh(n->ht_up);
 243                 off = stack[sdepth].off;
 244                 goto check_terminal;
 245         }
 246 out:
 247         return -1;
 248
 249 deadloop:
 250         net_warn_ratelimited("cls_u32: dead loop\n");
 251         return -1;
 252 }
 253
 254 static struct tc_u_hnode *u32_lookup_ht(struct tc_u_common *tp_c, u32 handle)
 255 {
 256         struct tc_u_hnode *ht;
 257
 258         for (ht = rtnl_dereference(tp_c->hlist);
 259              ht;
 260              ht = rtnl_dereference(ht->next))
 261                 if (ht->handle == handle)
 262                         break;
 263
 264         return ht;
 265 }
 266
 267 static struct tc_u_knode *u32_lookup_key(struct tc_u_hnode *ht, u32 handle)
 268 {
 269         unsigned int sel;
 270         struct tc_u_knode *n = NULL;
 271
 272         sel = TC_U32_HASH(handle);
 273         if (sel > ht->divisor)
 274                 goto out;
 275
 276         for (n = rtnl_dereference(ht->ht[sel]);
 277              n;
 278              n = rtnl_dereference(n->next))
 279                 if (n->handle == handle)
 280                         break;
 281 out:
 282         return n;
 283 }
 284
 285
 286 static void *u32_get(struct tcf_proto *tp, u32 handle)
 287 {
 288         struct tc_u_hnode *ht;
 289         struct tc_u_common *tp_c = tp->data;
 290
 291         if (TC_U32_HTID(handle) == TC_U32_ROOT)
 292                 ht = rtnl_dereference(tp->root);
 293         else
 294                 ht = u32_lookup_ht(tp_c, TC_U32_HTID(handle));
 295
 296         if (!ht)
 297                 return NULL;
 298
 299         if (TC_U32_KEY(handle) == 0)
 300                 return ht;
 301
 302         return u32_lookup_key(ht, handle);
 303 }
 304
 305 /* Protected by rtnl lock */
 306 static u32 gen_new_htid(struct tc_u_common *tp_c, struct tc_u_hnode *ptr)
 307 {
 308         int id = idr_alloc_cyclic(&tp_c->handle_idr, ptr, 1, 0x7FF, GFP_KERNEL);
 309         if (id < 0)
 310                 return 0;
 311         return (id | 0x800U) << 20;
 312 }
 313
 314 static struct hlist_head *tc_u_common_hash;
 315
 316 #define U32_HASH_SHIFT 10
 317 #define U32_HASH_SIZE (1 << U32_HASH_SHIFT)
 318
 319 static void *tc_u_common_ptr(const struct tcf_proto *tp)
 320 {
 321         struct tcf_block *block = tp->chain->block;
 322
 323         /* The block sharing is currently supported only
 324          * for classless qdiscs. In that case we use block
 325          * for tc_u_common identification. In case the
 326          * block is not shared, block->q is a valid pointer
 327          * and we can use that. That works for classful qdiscs.
 328          */
 329         if (tcf_block_shared(block))
 330                 return block;
 331         else
 332                 return block->q;
 333 }
 334
 335 static struct hlist_head *tc_u_hash(void *key)
 336 {
 337         return tc_u_common_hash + hash_ptr(key, U32_HASH_SHIFT);
 338 }
 339
 340 static struct tc_u_common *tc_u_common_find(void *key)
 341 {
 342         struct tc_u_common *tc;
 343         hlist_for_each_entry(tc, tc_u_hash(key), hnode) {
 344                 if (tc->ptr == key)
 345                         return tc;
 346         }
 347         return NULL;
 348 }
 349
 350 static int u32_init(struct tcf_proto *tp)
 351 {
 352         struct tc_u_hnode *root_ht;
 353         void *key = tc_u_common_ptr(tp);
 354         struct tc_u_common *tp_c = tc_u_common_find(key);
 355
 356         root_ht = kzalloc(struct_size(root_ht, ht, 1), GFP_KERNEL);
 357         if (root_ht == NULL)
 358                 return -ENOBUFS;
 359
 360         root_ht->refcnt++;
 361         root_ht->handle = tp_c ? gen_new_htid(tp_c, root_ht) : 0x80000000;
 362         root_ht->prio = tp->prio;
 363         root_ht->is_root = true;
 364         idr_init(&root_ht->handle_idr);
 365
 366         if (tp_c == NULL) {
 367                 tp_c = kzalloc(struct_size(tp_c, hlist->ht, 1), GFP_KERNEL);
 368                 if (tp_c == NULL) {
 369                         kfree(root_ht);
 370                         return -ENOBUFS;
 371                 }
 372                 tp_c->ptr = key;
 373                 INIT_HLIST_NODE(&tp_c->hnode);
 374                 idr_init(&tp_c->handle_idr);
 375
 376                 hlist_add_head(&tp_c->hnode, tc_u_hash(key));
 377         }
 378
 379         tp_c->refcnt++;
 380         RCU_INIT_POINTER(root_ht->next, tp_c->hlist);
 381         rcu_assign_pointer(tp_c->hlist, root_ht);
 382
 383         root_ht->refcnt++;
 384         rcu_assign_pointer(tp->root, root_ht);
 385         tp->data = tp_c;
 386         return 0;
 387 }
 388
 389 static int u32_destroy_key(struct tc_u_knode *n, bool free_pf)
 390 {
 391         struct tc_u_hnode *ht = rtnl_dereference(n->ht_down);
 392
 393         tcf_exts_destroy(&n->exts);
 394         tcf_exts_put_net(&n->exts);
 395         if (ht && --ht->refcnt == 0)
 396                 kfree(ht);
 397 #ifdef CONFIG_CLS_U32_PERF
 398         if (free_pf)
 399                 free_percpu(n->pf);
 400 #endif
 401 #ifdef CONFIG_CLS_U32_MARK
 402         if (free_pf)
 403                 free_percpu(n->pcpu_success);
 404 #endif
 405         kfree(n);
 406         return 0;
 407 }
 408
 409 /* u32_delete_key_rcu should be called when free'ing a copied
 410  * version of a tc_u_knode obtained from u32_init_knode(). When
 411  * copies are obtained from u32_init_knode() the statistics are
 412  * shared between the old and new copies to allow readers to
 413  * continue to update the statistics during the copy. To support
 414  * this the u32_delete_key_rcu variant does not free the percpu
 415  * statistics.
 416  */
 417 static void u32_delete_key_work(struct work_struct *work)
 418 {
 419         struct tc_u_knode *key = container_of(to_rcu_work(work),
 420                                               struct tc_u_knode,
 421                                               rwork);
 422         rtnl_lock();
 423         u32_destroy_key(key, false);
 424         rtnl_unlock();
 425 }
 426
 427 /* u32_delete_key_freepf_rcu is the rcu callback variant
 428  * that free's the entire structure including the statistics
 429  * percpu variables. Only use this if the key is not a copy
 430  * returned by u32_init_knode(). See u32_delete_key_rcu()
 431  * for the variant that should be used with keys return from
 432  * u32_init_knode()
 433  */
 434 static void u32_delete_key_freepf_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, true);
 441         rtnl_unlock();
 442 }
 443
 444 static int u32_delete_key(struct tcf_proto *tp, struct tc_u_knode *key)
 445 {
 446         struct tc_u_common *tp_c = tp->data;
 447         struct tc_u_knode __rcu **kp;
 448         struct tc_u_knode *pkp;
 449         struct tc_u_hnode *ht = rtnl_dereference(key->ht_up);
 450
 451         if (ht) {
 452                 kp = &ht->ht[TC_U32_HASH(key->handle)];
 453                 for (pkp = rtnl_dereference(*kp); pkp;
 454                      kp = &pkp->next, pkp = rtnl_dereference(*kp)) {
 455                         if (pkp == key) {
 456                                 RCU_INIT_POINTER(*kp, key->next);
 457                                 tp_c->knodes--;
 458
 459                                 tcf_unbind_filter(tp, &key->res);
 460                                 idr_remove(&ht->handle_idr, key->handle);
 461                                 tcf_exts_get_net(&key->exts);
 462                                 tcf_queue_work(&key->rwork, u32_delete_key_freepf_work);
 463                                 return 0;
 464                         }
 465                 }
 466         }
 467         WARN_ON(1);
 468         return 0;
 469 }
 470
 471 static void u32_clear_hw_hnode(struct tcf_proto *tp, struct tc_u_hnode *h,
 472                                struct netlink_ext_ack *extack)
 473 {
 474         struct tcf_block *block = tp->chain->block;
 475         struct tc_cls_u32_offload cls_u32 = {};
 476
 477         tc_cls_common_offload_init(&cls_u32.common, tp, h->flags, extack);
 478         cls_u32.command = TC_CLSU32_DELETE_HNODE;
 479         cls_u32.hnode.divisor = h->divisor;
 480         cls_u32.hnode.handle = h->handle;
 481         cls_u32.hnode.prio = h->prio;
 482
 483         tc_setup_cb_call(block, TC_SETUP_CLSU32, &cls_u32, false, true);
 484 }
 485
 486 static int u32_replace_hw_hnode(struct tcf_proto *tp, struct tc_u_hnode *h,
 487                                 u32 flags, struct netlink_ext_ack *extack)
 488 {
 489         struct tcf_block *block = tp->chain->block;
 490         struct tc_cls_u32_offload cls_u32 = {};
 491         bool skip_sw = tc_skip_sw(flags);
 492         bool offloaded = false;
 493         int err;
 494
 495         tc_cls_common_offload_init(&cls_u32.common, tp, flags, extack);
 496         cls_u32.command = TC_CLSU32_NEW_HNODE;
 497         cls_u32.hnode.divisor = h->divisor;
 498         cls_u32.hnode.handle = h->handle;
 499         cls_u32.hnode.prio = h->prio;
 500
 501         err = tc_setup_cb_call(block, TC_SETUP_CLSU32, &cls_u32, skip_sw, true);
 502         if (err < 0) {
 503                 u32_clear_hw_hnode(tp, h, NULL);
 504                 return err;
 505         } else if (err > 0) {
 506                 offloaded = true;
 507         }
 508
 509         if (skip_sw && !offloaded)
 510                 return -EINVAL;
 511
 512         return 0;
 513 }
 514
 515 static void u32_remove_hw_knode(struct tcf_proto *tp, struct tc_u_knode *n,
 516                                 struct netlink_ext_ack *extack)
 517 {
 518         struct tcf_block *block = tp->chain->block;
 519         struct tc_cls_u32_offload cls_u32 = {};
 520
 521         tc_cls_common_offload_init(&cls_u32.common, tp, n->flags, extack);
 522         cls_u32.command = TC_CLSU32_DELETE_KNODE;
 523         cls_u32.knode.handle = n->handle;
 524
 525         tc_setup_cb_destroy(block, tp, TC_SETUP_CLSU32, &cls_u32, false,
 526                             &n->flags, &n->in_hw_count, true);
 527 }
 528
 529 static int u32_replace_hw_knode(struct tcf_proto *tp, struct tc_u_knode *n,
 530                                 u32 flags, struct netlink_ext_ack *extack)
 531 {
 532         struct tc_u_hnode *ht = rtnl_dereference(n->ht_down);
 533         struct tcf_block *block = tp->chain->block;
 534         struct tc_cls_u32_offload cls_u32 = {};
 535         bool skip_sw = tc_skip_sw(flags);
 536         int err;
 537
 538         tc_cls_common_offload_init(&cls_u32.common, tp, flags, extack);
 539         cls_u32.command = TC_CLSU32_REPLACE_KNODE;
 540         cls_u32.knode.handle = n->handle;
 541         cls_u32.knode.fshift = n->fshift;
 542 #ifdef CONFIG_CLS_U32_MARK
 543         cls_u32.knode.val = n->val;
 544         cls_u32.knode.mask = n->mask;
 545 #else
 546         cls_u32.knode.val = 0;
 547         cls_u32.knode.mask = 0;
 548 #endif
 549         cls_u32.knode.sel = &n->sel;
 550         cls_u32.knode.res = &n->res;
 551         cls_u32.knode.exts = &n->exts;
 552         if (n->ht_down)
 553                 cls_u32.knode.link_handle = ht->handle;
 554
 555         err = tc_setup_cb_add(block, tp, TC_SETUP_CLSU32, &cls_u32, skip_sw,
 556                               &n->flags, &n->in_hw_count, true);
 557         if (err) {
 558                 u32_remove_hw_knode(tp, n, NULL);
 559                 return err;
 560         }
 561
 562         if (skip_sw && !(n->flags & TCA_CLS_FLAGS_IN_HW))
 563                 return -EINVAL;
 564
 565         return 0;
 566 }
 567
 568 static void u32_clear_hnode(struct tcf_proto *tp, struct tc_u_hnode *ht,
 569                             struct netlink_ext_ack *extack)
 570 {
 571         struct tc_u_common *tp_c = tp->data;
 572         struct tc_u_knode *n;
 573         unsigned int h;
 574
 575         for (h = 0; h <= ht->divisor; h++) {
 576                 while ((n = rtnl_dereference(ht->ht[h])) != NULL) {
 577                         RCU_INIT_POINTER(ht->ht[h],
 578                                          rtnl_dereference(n->next));
 579                         tp_c->knodes--;
 580                         tcf_unbind_filter(tp, &n->res);
 581                         u32_remove_hw_knode(tp, n, extack);
 582                         idr_remove(&ht->handle_idr, n->handle);
 583                         if (tcf_exts_get_net(&n->exts))
 584                                 tcf_queue_work(&n->rwork, u32_delete_key_freepf_work);
 585                         else
 586                                 u32_destroy_key(n, true);
 587                 }
 588         }
 589 }
 590
 591 static int u32_destroy_hnode(struct tcf_proto *tp, struct tc_u_hnode *ht,
 592                              struct netlink_ext_ack *extack)
 593 {
 594         struct tc_u_common *tp_c = tp->data;
 595         struct tc_u_hnode __rcu **hn;
 596         struct tc_u_hnode *phn;
 597
 598         WARN_ON(--ht->refcnt);
 599
 600         u32_clear_hnode(tp, ht, extack);
 601
 602         hn = &tp_c->hlist;
 603         for (phn = rtnl_dereference(*hn);
 604              phn;
 605              hn = &phn->next, phn = rtnl_dereference(*hn)) {
 606                 if (phn == ht) {
 607                         u32_clear_hw_hnode(tp, ht, extack);
 608                         idr_destroy(&ht->handle_idr);
 609                         idr_remove(&tp_c->handle_idr, ht->handle);
 610                         RCU_INIT_POINTER(*hn, ht->next);
 611                         kfree_rcu(ht, rcu);
 612                         return 0;
 613                 }
 614         }
 615
 616         return -ENOENT;
 617 }
 618
 619 static void u32_destroy(struct tcf_proto *tp, bool rtnl_held,
 620                         struct netlink_ext_ack *extack)
 621 {
 622         struct tc_u_common *tp_c = tp->data;
 623         struct tc_u_hnode *root_ht = rtnl_dereference(tp->root);
 624
 625         WARN_ON(root_ht == NULL);
 626
 627         if (root_ht && --root_ht->refcnt == 1)
 628                 u32_destroy_hnode(tp, root_ht, extack);
 629
 630         if (--tp_c->refcnt == 0) {
 631                 struct tc_u_hnode *ht;
 632
 633                 hlist_del(&tp_c->hnode);
 634
 635                 while ((ht = rtnl_dereference(tp_c->hlist)) != NULL) {
 636                         u32_clear_hnode(tp, ht, extack);
 637                         RCU_INIT_POINTER(tp_c->hlist, ht->next);
 638
 639                         /* u32_destroy_key() will later free ht for us, if it's
 640                          * still referenced by some knode
 641                          */
 642                         if (--ht->refcnt == 0)
 643                                 kfree_rcu(ht, rcu);
 644                 }
 645
 646                 idr_destroy(&tp_c->handle_idr);
 647                 kfree(tp_c);
 648         }
 649
 650         tp->data = NULL;
 651 }
 652
 653 static int u32_delete(struct tcf_proto *tp, void *arg, bool *last,
 654                       bool rtnl_held, struct netlink_ext_ack *extack)
 655 {
 656         struct tc_u_hnode *ht = arg;
 657         struct tc_u_common *tp_c = tp->data;
 658         int ret = 0;
 659
 660         if (TC_U32_KEY(ht->handle)) {
 661                 u32_remove_hw_knode(tp, (struct tc_u_knode *)ht, extack);
 662                 ret = u32_delete_key(tp, (struct tc_u_knode *)ht);
 663                 goto out;
 664         }
 665
 666         if (ht->is_root) {
 667                 NL_SET_ERR_MSG_MOD(extack, "Not allowed to delete root node");
 668                 return -EINVAL;
 669         }
 670
 671         if (ht->refcnt == 1) {
 672                 u32_destroy_hnode(tp, ht, extack);
 673         } else {
 674                 NL_SET_ERR_MSG_MOD(extack, "Can not delete in-use filter");
 675                 return -EBUSY;
 676         }
 677
 678 out:
 679         *last = tp_c->refcnt == 1 && tp_c->knodes == 0;
 680         return ret;
 681 }
 682
 683 static u32 gen_new_kid(struct tc_u_hnode *ht, u32 htid)
 684 {
 685         u32 index = htid | 0x800;
 686         u32 max = htid | 0xFFF;
 687
 688         if (idr_alloc_u32(&ht->handle_idr, NULL, &index, max, GFP_KERNEL)) {
 689                 index = htid + 1;
 690                 if (idr_alloc_u32(&ht->handle_idr, NULL, &index, max,
 691                                  GFP_KERNEL))
 692                         index = max;
 693         }
 694
 695         return index;
 696 }
 697
 698 static const struct nla_policy u32_policy[TCA_U32_MAX + 1] = {
 699         [TCA_U32_CLASSID]       = { .type = NLA_U32 },
 700         [TCA_U32_HASH]          = { .type = NLA_U32 },
 701         [TCA_U32_LINK]          = { .type = NLA_U32 },
 702         [TCA_U32_DIVISOR]       = { .type = NLA_U32 },
 703         [TCA_U32_SEL]           = { .len = sizeof(struct tc_u32_sel) },
 704         [TCA_U32_INDEV]         = { .type = NLA_STRING, .len = IFNAMSIZ },
 705         [TCA_U32_MARK]          = { .len = sizeof(struct tc_u32_mark) },
 706         [TCA_U32_FLAGS]         = { .type = NLA_U32 },
 707 };
 708
 709 static int u32_set_parms(struct net *net, struct tcf_proto *tp,
 710                          unsigned long base,
 711                          struct tc_u_knode *n, struct nlattr **tb,
 712                          struct nlattr *est, u32 flags, u32 fl_flags,
 713                          struct netlink_ext_ack *extack)
 714 {
 715         int err;
 716
 717         err = tcf_exts_validate_ex(net, tp, tb, est, &n->exts, flags,
 718                                    fl_flags, extack);
 719         if (err < 0)
 720                 return err;
 721
 722         if (tb[TCA_U32_LINK]) {
 723                 u32 handle = nla_get_u32(tb[TCA_U32_LINK]);
 724                 struct tc_u_hnode *ht_down = NULL, *ht_old;
 725
 726                 if (TC_U32_KEY(handle)) {
 727                         NL_SET_ERR_MSG_MOD(extack, "u32 Link handle must be a hash table");
 728                         return -EINVAL;
 729                 }
 730
 731                 if (handle) {
 732                         ht_down = u32_lookup_ht(tp->data, handle);
 733
 734                         if (!ht_down) {
 735                                 NL_SET_ERR_MSG_MOD(extack, "Link hash table not found");
 736                                 return -EINVAL;
 737                         }
 738                         if (ht_down->is_root) {
 739                                 NL_SET_ERR_MSG_MOD(extack, "Not linking to root node");
 740                                 return -EINVAL;
 741                         }
 742                         ht_down->refcnt++;
 743                 }
 744
 745                 ht_old = rtnl_dereference(n->ht_down);
 746                 rcu_assign_pointer(n->ht_down, ht_down);
 747
 748                 if (ht_old)
 749                         ht_old->refcnt--;
 750         }
 751         if (tb[TCA_U32_CLASSID]) {
 752                 n->res.classid = nla_get_u32(tb[TCA_U32_CLASSID]);
 753                 tcf_bind_filter(tp, &n->res, base);
 754         }
 755
 756         if (tb[TCA_U32_INDEV]) {
 757                 int ret;
 758                 ret = tcf_change_indev(net, tb[TCA_U32_INDEV], extack);
 759                 if (ret < 0)
 760                         return -EINVAL;
 761                 n->ifindex = ret;
 762         }
 763         return 0;
 764 }
 765
 766 static void u32_replace_knode(struct tcf_proto *tp, struct tc_u_common *tp_c,
 767                               struct tc_u_knode *n)
 768 {
 769         struct tc_u_knode __rcu **ins;
 770         struct tc_u_knode *pins;
 771         struct tc_u_hnode *ht;
 772
 773         if (TC_U32_HTID(n->handle) == TC_U32_ROOT)
 774                 ht = rtnl_dereference(tp->root);
 775         else
 776                 ht = u32_lookup_ht(tp_c, TC_U32_HTID(n->handle));
 777
 778         ins = &ht->ht[TC_U32_HASH(n->handle)];
 779
 780         /* The node must always exist for it to be replaced if this is not the
 781          * case then something went very wrong elsewhere.
 782          */
 783         for (pins = rtnl_dereference(*ins); ;
 784              ins = &pins->next, pins = rtnl_dereference(*ins))
 785                 if (pins->handle == n->handle)
 786                         break;
 787
 788         idr_replace(&ht->handle_idr, n, n->handle);
 789         RCU_INIT_POINTER(n->next, pins->next);
 790         rcu_assign_pointer(*ins, n);
 791 }
 792
 793 static struct tc_u_knode *u32_init_knode(struct net *net, struct tcf_proto *tp,
 794                                          struct tc_u_knode *n)
 795 {
 796         struct tc_u_hnode *ht = rtnl_dereference(n->ht_down);
 797         struct tc_u32_sel *s = &n->sel;
 798         struct tc_u_knode *new;
 799
 800         new = kzalloc(struct_size(new, sel.keys, s->nkeys), GFP_KERNEL);
 801         if (!new)
 802                 return NULL;
 803
 804         RCU_INIT_POINTER(new->next, n->next);
 805         new->handle = n->handle;
 806         RCU_INIT_POINTER(new->ht_up, n->ht_up);
 807
 808         new->ifindex = n->ifindex;
 809         new->fshift = n->fshift;
 810         new->res = n->res;
 811         new->flags = n->flags;
 812         RCU_INIT_POINTER(new->ht_down, ht);
 813
 814         /* bump reference count as long as we hold pointer to structure */
 815         if (ht)
 816                 ht->refcnt++;
 817
 818 #ifdef CONFIG_CLS_U32_PERF
 819         /* Statistics may be incremented by readers during update
 820          * so we must keep them in tact. When the node is later destroyed
 821          * a special destroy call must be made to not free the pf memory.
 822          */
 823         new->pf = n->pf;
 824 #endif
 825
 826 #ifdef CONFIG_CLS_U32_MARK
 827         new->val = n->val;
 828         new->mask = n->mask;
 829         /* Similarly success statistics must be moved as pointers */
 830         new->pcpu_success = n->pcpu_success;
 831 #endif
 832         memcpy(&new->sel, s, struct_size(s, keys, s->nkeys));
 833
 834         if (tcf_exts_init(&new->exts, net, TCA_U32_ACT, TCA_U32_POLICE)) {
 835                 kfree(new);
 836                 return NULL;
 837         }
 838
 839         return new;
 840 }
 841
 842 static int u32_change(struct net *net, struct sk_buff *in_skb,
 843                       struct tcf_proto *tp, unsigned long base, u32 handle,
 844                       struct nlattr **tca, void **arg, u32 flags,
 845                       struct netlink_ext_ack *extack)
 846 {
 847         struct tc_u_common *tp_c = tp->data;
 848         struct tc_u_hnode *ht;
 849         struct tc_u_knode *n;
 850         struct tc_u32_sel *s;
 851         struct nlattr *opt = tca[TCA_OPTIONS];
 852         struct nlattr *tb[TCA_U32_MAX + 1];
 853         u32 htid, userflags = 0;
 854         size_t sel_size;
 855         int err;
 856
 857         if (!opt) {
 858                 if (handle) {
 859                         NL_SET_ERR_MSG_MOD(extack, "Filter handle requires options");
 860                         return -EINVAL;
 861                 } else {
 862                         return 0;
 863                 }
 864         }
 865
 866         err = nla_parse_nested_deprecated(tb, TCA_U32_MAX, opt, u32_policy,
 867                                           extack);
 868         if (err < 0)
 869                 return err;
 870
 871         if (tb[TCA_U32_FLAGS]) {
 872                 userflags = nla_get_u32(tb[TCA_U32_FLAGS]);
 873                 if (!tc_flags_valid(userflags)) {
 874                         NL_SET_ERR_MSG_MOD(extack, "Invalid filter flags");
 875                         return -EINVAL;
 876                 }
 877         }
 878
 879         n = *arg;
 880         if (n) {
 881                 struct tc_u_knode *new;
 882
 883                 if (TC_U32_KEY(n->handle) == 0) {
 884                         NL_SET_ERR_MSG_MOD(extack, "Key node id cannot be zero");
 885                         return -EINVAL;
 886                 }
 887
 888                 if ((n->flags ^ userflags) &
 889                     ~(TCA_CLS_FLAGS_IN_HW | TCA_CLS_FLAGS_NOT_IN_HW)) {
 890                         NL_SET_ERR_MSG_MOD(extack, "Key node flags do not match passed flags");
 891                         return -EINVAL;
 892                 }
 893
 894                 new = u32_init_knode(net, tp, n);
 895                 if (!new)
 896                         return -ENOMEM;
 897
 898                 err = u32_set_parms(net, tp, base, new, tb,
 899                                     tca[TCA_RATE], flags, new->flags,
 900                                     extack);
 901
 902                 if (err) {
 903                         u32_destroy_key(new, false);
 904                         return err;
 905                 }
 906
 907                 err = u32_replace_hw_knode(tp, new, flags, extack);
 908                 if (err) {
 909                         u32_destroy_key(new, false);
 910                         return err;
 911                 }
 912
 913                 if (!tc_in_hw(new->flags))
 914                         new->flags |= TCA_CLS_FLAGS_NOT_IN_HW;
 915
 916                 u32_replace_knode(tp, tp_c, new);
 917                 tcf_unbind_filter(tp, &n->res);
 918                 tcf_exts_get_net(&n->exts);
 919                 tcf_queue_work(&n->rwork, u32_delete_key_work);
 920                 return 0;
 921         }
 922
 923         if (tb[TCA_U32_DIVISOR]) {
 924                 unsigned int divisor = nla_get_u32(tb[TCA_U32_DIVISOR]);
 925
 926                 if (!is_power_of_2(divisor)) {
 927                         NL_SET_ERR_MSG_MOD(extack, "Divisor is not a power of 2");
 928                         return -EINVAL;
 929                 }
 930                 if (divisor-- > 0x100) {
 931                         NL_SET_ERR_MSG_MOD(extack, "Exceeded maximum 256 hash buckets");
 932                         return -EINVAL;
 933                 }
 934                 if (TC_U32_KEY(handle)) {
 935                         NL_SET_ERR_MSG_MOD(extack, "Divisor can only be used on a hash table");
 936                         return -EINVAL;
 937                 }
 938                 ht = kzalloc(struct_size(ht, ht, divisor + 1), GFP_KERNEL);
 939                 if (ht == NULL)
 940                         return -ENOBUFS;
 941                 if (handle == 0) {
 942                         handle = gen_new_htid(tp->data, ht);
 943                         if (handle == 0) {
 944                                 kfree(ht);
 945                                 return -ENOMEM;
 946                         }
 947                 } else {
 948                         err = idr_alloc_u32(&tp_c->handle_idr, ht, &handle,
 949                                             handle, GFP_KERNEL);
 950                         if (err) {
 951                                 kfree(ht);
 952                                 return err;
 953                         }
 954                 }
 955                 ht->refcnt = 1;
 956                 ht->divisor = divisor;
 957                 ht->handle = handle;
 958                 ht->prio = tp->prio;
 959                 idr_init(&ht->handle_idr);
 960                 ht->flags = userflags;
 961
 962                 err = u32_replace_hw_hnode(tp, ht, userflags, extack);
 963                 if (err) {
 964                         idr_remove(&tp_c->handle_idr, handle);
 965                         kfree(ht);
 966                         return err;
 967                 }
 968
 969                 RCU_INIT_POINTER(ht->next, tp_c->hlist);
 970                 rcu_assign_pointer(tp_c->hlist, ht);
 971                 *arg = ht;
 972
 973                 return 0;
 974         }
 975
 976         if (tb[TCA_U32_HASH]) {
 977                 htid = nla_get_u32(tb[TCA_U32_HASH]);
 978                 if (TC_U32_HTID(htid) == TC_U32_ROOT) {
 979                         ht = rtnl_dereference(tp->root);
 980                         htid = ht->handle;
 981                 } else {
 982                         ht = u32_lookup_ht(tp->data, TC_U32_HTID(htid));
 983                         if (!ht) {
 984                                 NL_SET_ERR_MSG_MOD(extack, "Specified hash table not found");
 985                                 return -EINVAL;
 986                         }
 987                 }
 988         } else {
 989                 ht = rtnl_dereference(tp->root);
 990                 htid = ht->handle;
 991         }
 992
 993         if (ht->divisor < TC_U32_HASH(htid)) {
 994                 NL_SET_ERR_MSG_MOD(extack, "Specified hash table buckets exceed configured value");
 995                 return -EINVAL;
 996         }
 997
 998         if (handle) {
 999                 if (TC_U32_HTID(handle) && TC_U32_HTID(handle ^ htid)) {
1000                         NL_SET_ERR_MSG_MOD(extack, "Handle specified hash table address mismatch");
1001                         return -EINVAL;
1002                 }
1003                 handle = htid | TC_U32_NODE(handle);
1004                 err = idr_alloc_u32(&ht->handle_idr, NULL, &handle, handle,
1005                                     GFP_KERNEL);
1006                 if (err)
1007                         return err;
1008         } else
1009                 handle = gen_new_kid(ht, htid);
1010
1011         if (tb[TCA_U32_SEL] == NULL) {
1012                 NL_SET_ERR_MSG_MOD(extack, "Selector not specified");
1013                 err = -EINVAL;
1014                 goto erridr;
1015         }
1016
1017         s = nla_data(tb[TCA_U32_SEL]);
1018         sel_size = struct_size(s, keys, s->nkeys);
1019         if (nla_len(tb[TCA_U32_SEL]) < sel_size) {
1020                 err = -EINVAL;
1021                 goto erridr;
1022         }
1023
1024         n = kzalloc(struct_size(n, sel.keys, s->nkeys), GFP_KERNEL);
1025         if (n == NULL) {
1026                 err = -ENOBUFS;
1027                 goto erridr;
1028         }
1029
1030 #ifdef CONFIG_CLS_U32_PERF
1031         n->pf = __alloc_percpu(struct_size(n->pf, kcnts, s->nkeys),
1032                                __alignof__(struct tc_u32_pcnt));
1033         if (!n->pf) {
1034                 err = -ENOBUFS;
1035                 goto errfree;
1036         }
1037 #endif
1038
1039         memcpy(&n->sel, s, sel_size);
1040         RCU_INIT_POINTER(n->ht_up, ht);
1041         n->handle = handle;
1042         n->fshift = s->hmask ? ffs(ntohl(s->hmask)) - 1 : 0;
1043         n->flags = userflags;
1044
1045         err = tcf_exts_init(&n->exts, net, TCA_U32_ACT, TCA_U32_POLICE);
1046         if (err < 0)
1047                 goto errout;
1048
1049 #ifdef CONFIG_CLS_U32_MARK
1050         n->pcpu_success = alloc_percpu(u32);
1051         if (!n->pcpu_success) {
1052                 err = -ENOMEM;
1053                 goto errout;
1054         }
1055
1056         if (tb[TCA_U32_MARK]) {
1057                 struct tc_u32_mark *mark;
1058
1059                 mark = nla_data(tb[TCA_U32_MARK]);
1060                 n->val = mark->val;
1061                 n->mask = mark->mask;
1062         }
1063 #endif
1064
1065         err = u32_set_parms(net, tp, base, n, tb, tca[TCA_RATE],
1066                             flags, n->flags, extack);
1067         if (err == 0) {
1068                 struct tc_u_knode __rcu **ins;
1069                 struct tc_u_knode *pins;
1070
1071                 err = u32_replace_hw_knode(tp, n, flags, extack);
1072                 if (err)
1073                         goto errhw;
1074
1075                 if (!tc_in_hw(n->flags))
1076                         n->flags |= TCA_CLS_FLAGS_NOT_IN_HW;
1077
1078                 ins = &ht->ht[TC_U32_HASH(handle)];
1079                 for (pins = rtnl_dereference(*ins); pins;
1080                      ins = &pins->next, pins = rtnl_dereference(*ins))
1081                         if (TC_U32_NODE(handle) < TC_U32_NODE(pins->handle))
1082                                 break;
1083
1084                 RCU_INIT_POINTER(n->next, pins);
1085                 rcu_assign_pointer(*ins, n);
1086                 tp_c->knodes++;
1087                 *arg = n;
1088                 return 0;
1089         }
1090
1091 errhw:
1092 #ifdef CONFIG_CLS_U32_MARK
1093         free_percpu(n->pcpu_success);
1094 #endif
1095
1096 errout:
1097         tcf_exts_destroy(&n->exts);
1098 #ifdef CONFIG_CLS_U32_PERF
1099 errfree:
1100         free_percpu(n->pf);
1101 #endif
1102         kfree(n);
1103 erridr:
1104         idr_remove(&ht->handle_idr, handle);
1105         return err;
1106 }
1107
1108 static void u32_walk(struct tcf_proto *tp, struct tcf_walker *arg,
1109                      bool rtnl_held)
1110 {
1111         struct tc_u_common *tp_c = tp->data;
1112         struct tc_u_hnode *ht;
1113         struct tc_u_knode *n;
1114         unsigned int h;
1115
1116         if (arg->stop)
1117                 return;
1118
1119         for (ht = rtnl_dereference(tp_c->hlist);
1120              ht;
1121              ht = rtnl_dereference(ht->next)) {
1122                 if (ht->prio != tp->prio)
1123                         continue;
1124                 if (arg->count >= arg->skip) {
1125                         if (arg->fn(tp, ht, arg) < 0) {
1126                                 arg->stop = 1;
1127                                 return;
1128                         }
1129                 }
1130                 arg->count++;
1131                 for (h = 0; h <= ht->divisor; h++) {
1132                         for (n = rtnl_dereference(ht->ht[h]);
1133                              n;
1134                              n = rtnl_dereference(n->next)) {
1135                                 if (arg->count < arg->skip) {
1136                                         arg->count++;
1137                                         continue;
1138                                 }
1139                                 if (arg->fn(tp, n, arg) < 0) {
1140                                         arg->stop = 1;
1141                                         return;
1142                                 }
1143                                 arg->count++;
1144                         }
1145                 }
1146         }
1147 }
1148
1149 static int u32_reoffload_hnode(struct tcf_proto *tp, struct tc_u_hnode *ht,
1150                                bool add, flow_setup_cb_t *cb, void *cb_priv,
1151                                struct netlink_ext_ack *extack)
1152 {
1153         struct tc_cls_u32_offload cls_u32 = {};
1154         int err;
1155
1156         tc_cls_common_offload_init(&cls_u32.common, tp, ht->flags, extack);
1157         cls_u32.command = add ? TC_CLSU32_NEW_HNODE : TC_CLSU32_DELETE_HNODE;
1158         cls_u32.hnode.divisor = ht->divisor;
1159         cls_u32.hnode.handle = ht->handle;
1160         cls_u32.hnode.prio = ht->prio;
1161
1162         err = cb(TC_SETUP_CLSU32, &cls_u32, cb_priv);
1163         if (err && add && tc_skip_sw(ht->flags))
1164                 return err;
1165
1166         return 0;
1167 }
1168
1169 static int u32_reoffload_knode(struct tcf_proto *tp, struct tc_u_knode *n,
1170                                bool add, flow_setup_cb_t *cb, void *cb_priv,
1171                                struct netlink_ext_ack *extack)
1172 {
1173         struct tc_u_hnode *ht = rtnl_dereference(n->ht_down);
1174         struct tcf_block *block = tp->chain->block;
1175         struct tc_cls_u32_offload cls_u32 = {};
1176
1177         tc_cls_common_offload_init(&cls_u32.common, tp, n->flags, extack);
1178         cls_u32.command = add ?
1179                 TC_CLSU32_REPLACE_KNODE : TC_CLSU32_DELETE_KNODE;
1180         cls_u32.knode.handle = n->handle;
1181
1182         if (add) {
1183                 cls_u32.knode.fshift = n->fshift;
1184 #ifdef CONFIG_CLS_U32_MARK
1185                 cls_u32.knode.val = n->val;
1186                 cls_u32.knode.mask = n->mask;
1187 #else
1188                 cls_u32.knode.val = 0;
1189                 cls_u32.knode.mask = 0;
1190 #endif
1191                 cls_u32.knode.sel = &n->sel;
1192                 cls_u32.knode.res = &n->res;
1193                 cls_u32.knode.exts = &n->exts;
1194                 if (n->ht_down)
1195                         cls_u32.knode.link_handle = ht->handle;
1196         }
1197
1198         return tc_setup_cb_reoffload(block, tp, add, cb, TC_SETUP_CLSU32,
1199                                      &cls_u32, cb_priv, &n->flags,
1200                                      &n->in_hw_count);
1201 }
1202
1203 static int u32_reoffload(struct tcf_proto *tp, bool add, flow_setup_cb_t *cb,
1204                          void *cb_priv, struct netlink_ext_ack *extack)
1205 {
1206         struct tc_u_common *tp_c = tp->data;
1207         struct tc_u_hnode *ht;
1208         struct tc_u_knode *n;
1209         unsigned int h;
1210         int err;
1211
1212         for (ht = rtnl_dereference(tp_c->hlist);
1213              ht;
1214              ht = rtnl_dereference(ht->next)) {
1215                 if (ht->prio != tp->prio)
1216                         continue;
1217
1218                 /* When adding filters to a new dev, try to offload the
1219                  * hashtable first. When removing, do the filters before the
1220                  * hashtable.
1221                  */
1222                 if (add && !tc_skip_hw(ht->flags)) {
1223                         err = u32_reoffload_hnode(tp, ht, add, cb, cb_priv,
1224                                                   extack);
1225                         if (err)
1226                                 return err;
1227                 }
1228
1229                 for (h = 0; h <= ht->divisor; h++) {
1230                         for (n = rtnl_dereference(ht->ht[h]);
1231                              n;
1232                              n = rtnl_dereference(n->next)) {
1233                                 if (tc_skip_hw(n->flags))
1234                                         continue;
1235
1236                                 err = u32_reoffload_knode(tp, n, add, cb,
1237                                                           cb_priv, extack);
1238                                 if (err)
1239                                         return err;
1240                         }
1241                 }
1242
1243                 if (!add && !tc_skip_hw(ht->flags))
1244                         u32_reoffload_hnode(tp, ht, add, cb, cb_priv, extack);
1245         }
1246
1247         return 0;
1248 }
1249
1250 static void u32_bind_class(void *fh, u32 classid, unsigned long cl, void *q,
1251                            unsigned long base)
1252 {
1253         struct tc_u_knode *n = fh;
1254
1255         if (n && n->res.classid == classid) {
1256                 if (cl)
1257                         __tcf_bind_filter(q, &n->res, base);
1258                 else
1259                         __tcf_unbind_filter(q, &n->res);
1260         }
1261 }
1262
1263 static int u32_dump(struct net *net, struct tcf_proto *tp, void *fh,
1264                     struct sk_buff *skb, struct tcmsg *t, bool rtnl_held)
1265 {
1266         struct tc_u_knode *n = fh;
1267         struct tc_u_hnode *ht_up, *ht_down;
1268         struct nlattr *nest;
1269
1270         if (n == NULL)
1271                 return skb->len;
1272
1273         t->tcm_handle = n->handle;
1274
1275         nest = nla_nest_start_noflag(skb, TCA_OPTIONS);
1276         if (nest == NULL)
1277                 goto nla_put_failure;
1278
1279         if (TC_U32_KEY(n->handle) == 0) {
1280                 struct tc_u_hnode *ht = fh;
1281                 u32 divisor = ht->divisor + 1;
1282
1283                 if (nla_put_u32(skb, TCA_U32_DIVISOR, divisor))
1284                         goto nla_put_failure;
1285         } else {
1286 #ifdef CONFIG_CLS_U32_PERF
1287                 struct tc_u32_pcnt *gpf;
1288                 int cpu;
1289 #endif
1290
1291                 if (nla_put(skb, TCA_U32_SEL, struct_size(&n->sel, keys, n->sel.nkeys),
1292                             &n->sel))
1293                         goto nla_put_failure;
1294
1295                 ht_up = rtnl_dereference(n->ht_up);
1296                 if (ht_up) {
1297                         u32 htid = n->handle & 0xFFFFF000;
1298                         if (nla_put_u32(skb, TCA_U32_HASH, htid))
1299                                 goto nla_put_failure;
1300                 }
1301                 if (n->res.classid &&
1302                     nla_put_u32(skb, TCA_U32_CLASSID, n->res.classid))
1303                         goto nla_put_failure;
1304
1305                 ht_down = rtnl_dereference(n->ht_down);
1306                 if (ht_down &&
1307                     nla_put_u32(skb, TCA_U32_LINK, ht_down->handle))
1308                         goto nla_put_failure;
1309
1310                 if (n->flags && nla_put_u32(skb, TCA_U32_FLAGS, n->flags))
1311                         goto nla_put_failure;
1312
1313 #ifdef CONFIG_CLS_U32_MARK
1314                 if ((n->val || n->mask)) {
1315                         struct tc_u32_mark mark = {.val = n->val,
1316                                                    .mask = n->mask,
1317                                                    .success = 0};
1318                         int cpum;
1319
1320                         for_each_possible_cpu(cpum) {
1321                                 __u32 cnt = *per_cpu_ptr(n->pcpu_success, cpum);
1322
1323                                 mark.success += cnt;
1324                         }
1325
1326                         if (nla_put(skb, TCA_U32_MARK, sizeof(mark), &mark))
1327                                 goto nla_put_failure;
1328                 }
1329 #endif
1330
1331                 if (tcf_exts_dump(skb, &n->exts) < 0)
1332                         goto nla_put_failure;
1333
1334                 if (n->ifindex) {
1335                         struct net_device *dev;
1336                         dev = __dev_get_by_index(net, n->ifindex);
1337                         if (dev && nla_put_string(skb, TCA_U32_INDEV, dev->name))
1338                                 goto nla_put_failure;
1339                 }
1340 #ifdef CONFIG_CLS_U32_PERF
1341                 gpf = kzalloc(struct_size(gpf, kcnts, n->sel.nkeys), GFP_KERNEL);
1342                 if (!gpf)
1343                         goto nla_put_failure;
1344
1345                 for_each_possible_cpu(cpu) {
1346                         int i;
1347                         struct tc_u32_pcnt *pf = per_cpu_ptr(n->pf, cpu);
1348
1349                         gpf->rcnt += pf->rcnt;
1350                         gpf->rhit += pf->rhit;
1351                         for (i = 0; i < n->sel.nkeys; i++)
1352                                 gpf->kcnts[i] += pf->kcnts[i];
1353                 }
1354
1355                 if (nla_put_64bit(skb, TCA_U32_PCNT, struct_size(gpf, kcnts, n->sel.nkeys),
1356                                   gpf, TCA_U32_PAD)) {
1357                         kfree(gpf);
1358                         goto nla_put_failure;
1359                 }
1360                 kfree(gpf);
1361 #endif
1362         }
1363
1364         nla_nest_end(skb, nest);
1365
1366         if (TC_U32_KEY(n->handle))
1367                 if (tcf_exts_dump_stats(skb, &n->exts) < 0)
1368                         goto nla_put_failure;
1369         return skb->len;
1370
1371 nla_put_failure:
1372         nla_nest_cancel(skb, nest);
1373         return -1;
1374 }
1375
1376 static struct tcf_proto_ops cls_u32_ops __read_mostly = {
1377         .kind           =       "u32",
1378         .classify       =       u32_classify,
1379         .init           =       u32_init,
1380         .destroy        =       u32_destroy,
1381         .get            =       u32_get,
1382         .change         =       u32_change,
1383         .delete         =       u32_delete,
1384         .walk           =       u32_walk,
1385         .reoffload      =       u32_reoffload,
1386         .dump           =       u32_dump,
1387         .bind_class     =       u32_bind_class,
1388         .owner          =       THIS_MODULE,
1389 };
1390
1391 static int __init init_u32(void)
1392 {
1393         int i, ret;
1394
1395         pr_info("u32 classifier\n");
1396 #ifdef CONFIG_CLS_U32_PERF
1397         pr_info("    Performance counters on\n");
1398 #endif
1399         pr_info("    input device check on\n");
1400 #ifdef CONFIG_NET_CLS_ACT
1401         pr_info("    Actions configured\n");
1402 #endif
1403         tc_u_common_hash = kvmalloc_array(U32_HASH_SIZE,
1404                                           sizeof(struct hlist_head),
1405                                           GFP_KERNEL);
1406         if (!tc_u_common_hash)
1407                 return -ENOMEM;
1408
1409         for (i = 0; i < U32_HASH_SIZE; i++)
1410                 INIT_HLIST_HEAD(&tc_u_common_hash[i]);
1411
1412         ret = register_tcf_proto_ops(&cls_u32_ops);
1413         if (ret)
1414                 kvfree(tc_u_common_hash);
1415         return ret;
1416 }
1417
1418 static void __exit exit_u32(void)
1419 {
1420         unregister_tcf_proto_ops(&cls_u32_ops);
1421         kvfree(tc_u_common_hash);
1422 }
1423
1424 module_init(init_u32)
1425 module_exit(exit_u32)
1426 MODULE_LICENSE("GPL");