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         unsigned int            in_hw_count;
  66 #ifdef CONFIG_CLS_U32_MARK
  67         u32                     val;
  68         u32                     mask;
  69         u32 __percpu            *pcpu_success;
  70 #endif
  71         struct tcf_proto        *tp;
  72         struct rcu_work         rwork;
  73         /* The 'sel' field MUST be the last field in structure to allow for
  74          * tc_u32_keys allocated at end of structure.
  75          */
  76         struct tc_u32_sel       sel;
  77 };
  78
  79 struct tc_u_hnode {
  80         struct tc_u_hnode __rcu *next;
  81         u32                     handle;
  82         u32                     prio;
  83         struct tc_u_common      *tp_c;
  84         int                     refcnt;
  85         unsigned int            divisor;
  86         struct idr              handle_idr;
  87         struct rcu_head         rcu;
  88         u32                     flags;
  89         /* The 'ht' field MUST be the last field in structure to allow for
  90          * more entries allocated at end of structure.
  91          */
  92         struct tc_u_knode __rcu *ht[1];
  93 };
  94
  95 struct tc_u_common {
  96         struct tc_u_hnode __rcu *hlist;
  97         void                    *ptr;
  98         int                     refcnt;
  99         struct idr              handle_idr;
 100         struct hlist_node       hnode;
 101         struct rcu_head         rcu;
 102 };
 103
 104 static inline unsigned int u32_hash_fold(__be32 key,
 105                                          const struct tc_u32_sel *sel,
 106                                          u8 fshift)
 107 {
 108         unsigned int h = ntohl(key & sel->hmask) >> fshift;
 109
 110         return h;
 111 }
 112
 113 static int u32_classify(struct sk_buff *skb, const struct tcf_proto *tp,
 114                         struct tcf_result *res)
 115 {
 116         struct {
 117                 struct tc_u_knode *knode;
 118                 unsigned int      off;
 119         } stack[TC_U32_MAXDEPTH];
 120
 121         struct tc_u_hnode *ht = rcu_dereference_bh(tp->root);
 122         unsigned int off = skb_network_offset(skb);
 123         struct tc_u_knode *n;
 124         int sdepth = 0;
 125         int off2 = 0;
 126         int sel = 0;
 127 #ifdef CONFIG_CLS_U32_PERF
 128         int j;
 129 #endif
 130         int i, r;
 131
 132 next_ht:
 133         n = rcu_dereference_bh(ht->ht[sel]);
 134
 135 next_knode:
 136         if (n) {
 137                 struct tc_u32_key *key = n->sel.keys;
 138
 139 #ifdef CONFIG_CLS_U32_PERF
 140                 __this_cpu_inc(n->pf->rcnt);
 141                 j = 0;
 142 #endif
 143
 144                 if (tc_skip_sw(n->flags)) {
 145                         n = rcu_dereference_bh(n->next);
 146                         goto next_knode;
 147                 }
 148
 149 #ifdef CONFIG_CLS_U32_MARK
 150                 if ((skb->mark & n->mask) != n->val) {
 151                         n = rcu_dereference_bh(n->next);
 152                         goto next_knode;
 153                 } else {
 154                         __this_cpu_inc(*n->pcpu_success);
 155                 }
 156 #endif
 157
 158                 for (i = n->sel.nkeys; i > 0; i--, key++) {
 159                         int toff = off + key->off + (off2 & key->offmask);
 160                         __be32 *data, hdata;
 161
 162                         if (skb_headroom(skb) + toff > INT_MAX)
 163                                 goto out;
 164
 165                         data = skb_header_pointer(skb, toff, 4, &hdata);
 166                         if (!data)
 167                                 goto out;
 168                         if ((*data ^ key->val) & key->mask) {
 169                                 n = rcu_dereference_bh(n->next);
 170                                 goto next_knode;
 171                         }
 172 #ifdef CONFIG_CLS_U32_PERF
 173                         __this_cpu_inc(n->pf->kcnts[j]);
 174                         j++;
 175 #endif
 176                 }
 177
 178                 ht = rcu_dereference_bh(n->ht_down);
 179                 if (!ht) {
 180 check_terminal:
 181                         if (n->sel.flags & TC_U32_TERMINAL) {
 182
 183                                 *res = n->res;
 184 #ifdef CONFIG_NET_CLS_IND
 185                                 if (!tcf_match_indev(skb, n->ifindex)) {
 186                                         n = rcu_dereference_bh(n->next);
 187                                         goto next_knode;
 188                                 }
 189 #endif
 190 #ifdef CONFIG_CLS_U32_PERF
 191                                 __this_cpu_inc(n->pf->rhit);
 192 #endif
 193                                 r = tcf_exts_exec(skb, &n->exts, res);
 194                                 if (r < 0) {
 195                                         n = rcu_dereference_bh(n->next);
 196                                         goto next_knode;
 197                                 }
 198
 199                                 return r;
 200                         }
 201                         n = rcu_dereference_bh(n->next);
 202                         goto next_knode;
 203                 }
 204
 205                 /* PUSH */
 206                 if (sdepth >= TC_U32_MAXDEPTH)
 207                         goto deadloop;
 208                 stack[sdepth].knode = n;
 209                 stack[sdepth].off = off;
 210                 sdepth++;
 211
 212                 ht = rcu_dereference_bh(n->ht_down);
 213                 sel = 0;
 214                 if (ht->divisor) {
 215                         __be32 *data, hdata;
 216
 217                         data = skb_header_pointer(skb, off + n->sel.hoff, 4,
 218                                                   &hdata);
 219                         if (!data)
 220                                 goto out;
 221                         sel = ht->divisor & u32_hash_fold(*data, &n->sel,
 222                                                           n->fshift);
 223                 }
 224                 if (!(n->sel.flags & (TC_U32_VAROFFSET | TC_U32_OFFSET | TC_U32_EAT)))
 225                         goto next_ht;
 226
 227                 if (n->sel.flags & (TC_U32_OFFSET | TC_U32_VAROFFSET)) {
 228                         off2 = n->sel.off + 3;
 229                         if (n->sel.flags & TC_U32_VAROFFSET) {
 230                                 __be16 *data, hdata;
 231
 232                                 data = skb_header_pointer(skb,
 233                                                           off + n->sel.offoff,
 234                                                           2, &hdata);
 235                                 if (!data)
 236                                         goto out;
 237                                 off2 += ntohs(n->sel.offmask & *data) >>
 238                                         n->sel.offshift;
 239                         }
 240                         off2 &= ~3;
 241                 }
 242                 if (n->sel.flags & TC_U32_EAT) {
 243                         off += off2;
 244                         off2 = 0;
 245                 }
 246
 247                 if (off < skb->len)
 248                         goto next_ht;
 249         }
 250
 251         /* POP */
 252         if (sdepth--) {
 253                 n = stack[sdepth].knode;
 254                 ht = rcu_dereference_bh(n->ht_up);
 255                 off = stack[sdepth].off;
 256                 goto check_terminal;
 257         }
 258 out:
 259         return -1;
 260
 261 deadloop:
 262         net_warn_ratelimited("cls_u32: dead loop\n");
 263         return -1;
 264 }
 265
 266 static struct tc_u_hnode *u32_lookup_ht(struct tc_u_common *tp_c, u32 handle)
 267 {
 268         struct tc_u_hnode *ht;
 269
 270         for (ht = rtnl_dereference(tp_c->hlist);
 271              ht;
 272              ht = rtnl_dereference(ht->next))
 273                 if (ht->handle == handle)
 274                         break;
 275
 276         return ht;
 277 }
 278
 279 static struct tc_u_knode *u32_lookup_key(struct tc_u_hnode *ht, u32 handle)
 280 {
 281         unsigned int sel;
 282         struct tc_u_knode *n = NULL;
 283
 284         sel = TC_U32_HASH(handle);
 285         if (sel > ht->divisor)
 286                 goto out;
 287
 288         for (n = rtnl_dereference(ht->ht[sel]);
 289              n;
 290              n = rtnl_dereference(n->next))
 291                 if (n->handle == handle)
 292                         break;
 293 out:
 294         return n;
 295 }
 296
 297
 298 static void *u32_get(struct tcf_proto *tp, u32 handle)
 299 {
 300         struct tc_u_hnode *ht;
 301         struct tc_u_common *tp_c = tp->data;
 302
 303         if (TC_U32_HTID(handle) == TC_U32_ROOT)
 304                 ht = rtnl_dereference(tp->root);
 305         else
 306                 ht = u32_lookup_ht(tp_c, TC_U32_HTID(handle));
 307
 308         if (!ht)
 309                 return NULL;
 310
 311         if (TC_U32_KEY(handle) == 0)
 312                 return ht;
 313
 314         return u32_lookup_key(ht, handle);
 315 }
 316
 317 /* Protected by rtnl lock */
 318 static u32 gen_new_htid(struct tc_u_common *tp_c, struct tc_u_hnode *ptr)
 319 {
 320         int id = idr_alloc_cyclic(&tp_c->handle_idr, ptr, 1, 0x7FF, GFP_KERNEL);
 321         if (id < 0)
 322                 return 0;
 323         return (id | 0x800U) << 20;
 324 }
 325
 326 static struct hlist_head *tc_u_common_hash;
 327
 328 #define U32_HASH_SHIFT 10
 329 #define U32_HASH_SIZE (1 << U32_HASH_SHIFT)
 330
 331 static void *tc_u_common_ptr(const struct tcf_proto *tp)
 332 {
 333         struct tcf_block *block = tp->chain->block;
 334
 335         /* The block sharing is currently supported only
 336          * for classless qdiscs. In that case we use block
 337          * for tc_u_common identification. In case the
 338          * block is not shared, block->q is a valid pointer
 339          * and we can use that. That works for classful qdiscs.
 340          */
 341         if (tcf_block_shared(block))
 342                 return block;
 343         else
 344                 return block->q;
 345 }
 346
 347 static unsigned int tc_u_hash(const struct tcf_proto *tp)
 348 {
 349         return hash_ptr(tc_u_common_ptr(tp), U32_HASH_SHIFT);
 350 }
 351
 352 static struct tc_u_common *tc_u_common_find(const struct tcf_proto *tp)
 353 {
 354         struct tc_u_common *tc;
 355         unsigned int h;
 356
 357         h = tc_u_hash(tp);
 358         hlist_for_each_entry(tc, &tc_u_common_hash[h], hnode) {
 359                 if (tc->ptr == tc_u_common_ptr(tp))
 360                         return tc;
 361         }
 362         return NULL;
 363 }
 364
 365 static int u32_init(struct tcf_proto *tp)
 366 {
 367         struct tc_u_hnode *root_ht;
 368         struct tc_u_common *tp_c;
 369         unsigned int h;
 370
 371         tp_c = tc_u_common_find(tp);
 372
 373         root_ht = kzalloc(sizeof(*root_ht), GFP_KERNEL);
 374         if (root_ht == NULL)
 375                 return -ENOBUFS;
 376
 377         root_ht->refcnt++;
 378         root_ht->handle = tp_c ? gen_new_htid(tp_c, root_ht) : 0x80000000;
 379         root_ht->prio = tp->prio;
 380         idr_init(&root_ht->handle_idr);
 381
 382         if (tp_c == NULL) {
 383                 tp_c = kzalloc(sizeof(*tp_c), GFP_KERNEL);
 384                 if (tp_c == NULL) {
 385                         kfree(root_ht);
 386                         return -ENOBUFS;
 387                 }
 388                 tp_c->ptr = tc_u_common_ptr(tp);
 389                 INIT_HLIST_NODE(&tp_c->hnode);
 390                 idr_init(&tp_c->handle_idr);
 391
 392                 h = tc_u_hash(tp);
 393                 hlist_add_head(&tp_c->hnode, &tc_u_common_hash[h]);
 394         }
 395
 396         tp_c->refcnt++;
 397         RCU_INIT_POINTER(root_ht->next, tp_c->hlist);
 398         rcu_assign_pointer(tp_c->hlist, root_ht);
 399         root_ht->tp_c = tp_c;
 400
 401         root_ht->refcnt++;
 402         rcu_assign_pointer(tp->root, root_ht);
 403         tp->data = tp_c;
 404         return 0;
 405 }
 406
 407 static void __u32_destroy_key(struct tc_u_knode *n)
 408 {
 409         struct tc_u_hnode *ht = rtnl_dereference(n->ht_down);
 410
 411         tcf_exts_destroy(&n->exts);
 412         if (ht && --ht->refcnt == 0)
 413                 kfree(ht);
 414         kfree(n);
 415 }
 416
 417 static void u32_destroy_key(struct tcf_proto *tp, struct tc_u_knode *n,
 418                             bool free_pf)
 419 {
 420         tcf_exts_put_net(&n->exts);
 421 #ifdef CONFIG_CLS_U32_PERF
 422         if (free_pf)
 423                 free_percpu(n->pf);
 424 #endif
 425 #ifdef CONFIG_CLS_U32_MARK
 426         if (free_pf)
 427                 free_percpu(n->pcpu_success);
 428 #endif
 429         __u32_destroy_key(n);
 430 }
 431
 432 /* u32_delete_key_rcu should be called when free'ing a copied
 433  * version of a tc_u_knode obtained from u32_init_knode(). When
 434  * copies are obtained from u32_init_knode() the statistics are
 435  * shared between the old and new copies to allow readers to
 436  * continue to update the statistics during the copy. To support
 437  * this the u32_delete_key_rcu variant does not free the percpu
 438  * statistics.
 439  */
 440 static void u32_delete_key_work(struct work_struct *work)
 441 {
 442         struct tc_u_knode *key = container_of(to_rcu_work(work),
 443                                               struct tc_u_knode,
 444                                               rwork);
 445         rtnl_lock();
 446         u32_destroy_key(key->tp, key, false);
 447         rtnl_unlock();
 448 }
 449
 450 /* u32_delete_key_freepf_rcu is the rcu callback variant
 451  * that free's the entire structure including the statistics
 452  * percpu variables. Only use this if the key is not a copy
 453  * returned by u32_init_knode(). See u32_delete_key_rcu()
 454  * for the variant that should be used with keys return from
 455  * u32_init_knode()
 456  */
 457 static void u32_delete_key_freepf_work(struct work_struct *work)
 458 {
 459         struct tc_u_knode *key = container_of(to_rcu_work(work),
 460                                               struct tc_u_knode,
 461                                               rwork);
 462         rtnl_lock();
 463         u32_destroy_key(key->tp, key, true);
 464         rtnl_unlock();
 465 }
 466
 467 static int u32_delete_key(struct tcf_proto *tp, struct tc_u_knode *key)
 468 {
 469         struct tc_u_knode __rcu **kp;
 470         struct tc_u_knode *pkp;
 471         struct tc_u_hnode *ht = rtnl_dereference(key->ht_up);
 472
 473         if (ht) {
 474                 kp = &ht->ht[TC_U32_HASH(key->handle)];
 475                 for (pkp = rtnl_dereference(*kp); pkp;
 476                      kp = &pkp->next, pkp = rtnl_dereference(*kp)) {
 477                         if (pkp == key) {
 478                                 RCU_INIT_POINTER(*kp, key->next);
 479
 480                                 tcf_unbind_filter(tp, &key->res);
 481                                 idr_remove(&ht->handle_idr, key->handle);
 482                                 tcf_exts_get_net(&key->exts);
 483                                 tcf_queue_work(&key->rwork, u32_delete_key_freepf_work);
 484                                 return 0;
 485                         }
 486                 }
 487         }
 488         WARN_ON(1);
 489         return 0;
 490 }
 491
 492 static void u32_clear_hw_hnode(struct tcf_proto *tp, struct tc_u_hnode *h,
 493                                struct netlink_ext_ack *extack)
 494 {
 495         struct tcf_block *block = tp->chain->block;
 496         struct tc_cls_u32_offload cls_u32 = {};
 497
 498         tc_cls_common_offload_init(&cls_u32.common, tp, h->flags, extack);
 499         cls_u32.command = TC_CLSU32_DELETE_HNODE;
 500         cls_u32.hnode.divisor = h->divisor;
 501         cls_u32.hnode.handle = h->handle;
 502         cls_u32.hnode.prio = h->prio;
 503
 504         tc_setup_cb_call(block, NULL, TC_SETUP_CLSU32, &cls_u32, false);
 505 }
 506
 507 static int u32_replace_hw_hnode(struct tcf_proto *tp, struct tc_u_hnode *h,
 508                                 u32 flags, struct netlink_ext_ack *extack)
 509 {
 510         struct tcf_block *block = tp->chain->block;
 511         struct tc_cls_u32_offload cls_u32 = {};
 512         bool skip_sw = tc_skip_sw(flags);
 513         bool offloaded = false;
 514         int err;
 515
 516         tc_cls_common_offload_init(&cls_u32.common, tp, flags, extack);
 517         cls_u32.command = TC_CLSU32_NEW_HNODE;
 518         cls_u32.hnode.divisor = h->divisor;
 519         cls_u32.hnode.handle = h->handle;
 520         cls_u32.hnode.prio = h->prio;
 521
 522         err = tc_setup_cb_call(block, NULL, TC_SETUP_CLSU32, &cls_u32, skip_sw);
 523         if (err < 0) {
 524                 u32_clear_hw_hnode(tp, h, NULL);
 525                 return err;
 526         } else if (err > 0) {
 527                 offloaded = true;
 528         }
 529
 530         if (skip_sw && !offloaded)
 531                 return -EINVAL;
 532
 533         return 0;
 534 }
 535
 536 static void u32_remove_hw_knode(struct tcf_proto *tp, struct tc_u_knode *n,
 537                                 struct netlink_ext_ack *extack)
 538 {
 539         struct tcf_block *block = tp->chain->block;
 540         struct tc_cls_u32_offload cls_u32 = {};
 541
 542         tc_cls_common_offload_init(&cls_u32.common, tp, n->flags, extack);
 543         cls_u32.command = TC_CLSU32_DELETE_KNODE;
 544         cls_u32.knode.handle = n->handle;
 545
 546         tc_setup_cb_call(block, NULL, TC_SETUP_CLSU32, &cls_u32, false);
 547         tcf_block_offload_dec(block, &n->flags);
 548 }
 549
 550 static int u32_replace_hw_knode(struct tcf_proto *tp, struct tc_u_knode *n,
 551                                 u32 flags, struct netlink_ext_ack *extack)
 552 {
 553         struct tc_u_hnode *ht = rtnl_dereference(n->ht_down);
 554         struct tcf_block *block = tp->chain->block;
 555         struct tc_cls_u32_offload cls_u32 = {};
 556         bool skip_sw = tc_skip_sw(flags);
 557         int err;
 558
 559         tc_cls_common_offload_init(&cls_u32.common, tp, flags, extack);
 560         cls_u32.command = TC_CLSU32_REPLACE_KNODE;
 561         cls_u32.knode.handle = n->handle;
 562         cls_u32.knode.fshift = n->fshift;
 563 #ifdef CONFIG_CLS_U32_MARK
 564         cls_u32.knode.val = n->val;
 565         cls_u32.knode.mask = n->mask;
 566 #else
 567         cls_u32.knode.val = 0;
 568         cls_u32.knode.mask = 0;
 569 #endif
 570         cls_u32.knode.sel = &n->sel;
 571         cls_u32.knode.exts = &n->exts;
 572         if (n->ht_down)
 573                 cls_u32.knode.link_handle = ht->handle;
 574
 575         err = tc_setup_cb_call(block, NULL, TC_SETUP_CLSU32, &cls_u32, skip_sw);
 576         if (err < 0) {
 577                 u32_remove_hw_knode(tp, n, NULL);
 578                 return err;
 579         } else if (err > 0) {
 580                 n->in_hw_count = err;
 581                 tcf_block_offload_inc(block, &n->flags);
 582         }
 583
 584         if (skip_sw && !(n->flags & TCA_CLS_FLAGS_IN_HW))
 585                 return -EINVAL;
 586
 587         return 0;
 588 }
 589
 590 static void u32_clear_hnode(struct tcf_proto *tp, struct tc_u_hnode *ht,
 591                             struct netlink_ext_ack *extack)
 592 {
 593         struct tc_u_knode *n;
 594         unsigned int h;
 595
 596         for (h = 0; h <= ht->divisor; h++) {
 597                 while ((n = rtnl_dereference(ht->ht[h])) != NULL) {
 598                         RCU_INIT_POINTER(ht->ht[h],
 599                                          rtnl_dereference(n->next));
 600                         tcf_unbind_filter(tp, &n->res);
 601                         u32_remove_hw_knode(tp, n, extack);
 602                         idr_remove(&ht->handle_idr, n->handle);
 603                         if (tcf_exts_get_net(&n->exts))
 604                                 tcf_queue_work(&n->rwork, u32_delete_key_freepf_work);
 605                         else
 606                                 u32_destroy_key(n->tp, n, true);
 607                 }
 608         }
 609 }
 610
 611 static int u32_destroy_hnode(struct tcf_proto *tp, struct tc_u_hnode *ht,
 612                              struct netlink_ext_ack *extack)
 613 {
 614         struct tc_u_common *tp_c = tp->data;
 615         struct tc_u_hnode __rcu **hn;
 616         struct tc_u_hnode *phn;
 617
 618         WARN_ON(--ht->refcnt);
 619
 620         u32_clear_hnode(tp, ht, extack);
 621
 622         hn = &tp_c->hlist;
 623         for (phn = rtnl_dereference(*hn);
 624              phn;
 625              hn = &phn->next, phn = rtnl_dereference(*hn)) {
 626                 if (phn == ht) {
 627                         u32_clear_hw_hnode(tp, ht, extack);
 628                         idr_destroy(&ht->handle_idr);
 629                         idr_remove(&tp_c->handle_idr, ht->handle);
 630                         RCU_INIT_POINTER(*hn, ht->next);
 631                         kfree_rcu(ht, rcu);
 632                         return 0;
 633                 }
 634         }
 635
 636         return -ENOENT;
 637 }
 638
 639 static bool ht_empty(struct tc_u_hnode *ht)
 640 {
 641         unsigned int h;
 642
 643         for (h = 0; h <= ht->divisor; h++)
 644                 if (rcu_access_pointer(ht->ht[h]))
 645                         return false;
 646
 647         return true;
 648 }
 649
 650 static void u32_destroy(struct tcf_proto *tp, struct netlink_ext_ack *extack)
 651 {
 652         struct tc_u_common *tp_c = tp->data;
 653         struct tc_u_hnode *root_ht = rtnl_dereference(tp->root);
 654
 655         WARN_ON(root_ht == NULL);
 656
 657         if (root_ht && --root_ht->refcnt == 1)
 658                 u32_destroy_hnode(tp, root_ht, extack);
 659
 660         if (--tp_c->refcnt == 0) {
 661                 struct tc_u_hnode *ht;
 662
 663                 hlist_del(&tp_c->hnode);
 664
 665                 while ((ht = rtnl_dereference(tp_c->hlist)) != NULL) {
 666                         u32_clear_hnode(tp, ht, extack);
 667                         RCU_INIT_POINTER(tp_c->hlist, ht->next);
 668
 669                         /* u32_destroy_key() will later free ht for us, if it's
 670                          * still referenced by some knode
 671                          */
 672                         if (--ht->refcnt == 0)
 673                                 kfree_rcu(ht, rcu);
 674                 }
 675
 676                 idr_destroy(&tp_c->handle_idr);
 677                 kfree(tp_c);
 678         }
 679
 680         tp->data = NULL;
 681 }
 682
 683 static int u32_delete(struct tcf_proto *tp, void *arg, bool *last,
 684                       struct netlink_ext_ack *extack)
 685 {
 686         struct tc_u_hnode *ht = arg;
 687         struct tc_u_hnode *root_ht = rtnl_dereference(tp->root);
 688         struct tc_u_common *tp_c = tp->data;
 689         int ret = 0;
 690
 691         if (ht == NULL)
 692                 goto out;
 693
 694         if (TC_U32_KEY(ht->handle)) {
 695                 u32_remove_hw_knode(tp, (struct tc_u_knode *)ht, extack);
 696                 ret = u32_delete_key(tp, (struct tc_u_knode *)ht);
 697                 goto out;
 698         }
 699
 700         if (root_ht == ht) {
 701                 NL_SET_ERR_MSG_MOD(extack, "Not allowed to delete root node");
 702                 return -EINVAL;
 703         }
 704
 705         if (ht->refcnt == 1) {
 706                 u32_destroy_hnode(tp, ht, extack);
 707         } else {
 708                 NL_SET_ERR_MSG_MOD(extack, "Can not delete in-use filter");
 709                 return -EBUSY;
 710         }
 711
 712 out:
 713         *last = true;
 714         if (root_ht) {
 715                 if (root_ht->refcnt > 2) {
 716                         *last = false;
 717                         goto ret;
 718                 }
 719                 if (root_ht->refcnt == 2) {
 720                         if (!ht_empty(root_ht)) {
 721                                 *last = false;
 722                                 goto ret;
 723                         }
 724                 }
 725         }
 726
 727         if (tp_c->refcnt > 1) {
 728                 *last = false;
 729                 goto ret;
 730         }
 731
 732         if (tp_c->refcnt == 1) {
 733                 struct tc_u_hnode *ht;
 734
 735                 for (ht = rtnl_dereference(tp_c->hlist);
 736                      ht;
 737                      ht = rtnl_dereference(ht->next))
 738                         if (!ht_empty(ht)) {
 739                                 *last = false;
 740                                 break;
 741                         }
 742         }
 743
 744 ret:
 745         return ret;
 746 }
 747
 748 static u32 gen_new_kid(struct tc_u_hnode *ht, u32 htid)
 749 {
 750         u32 index = htid | 0x800;
 751         u32 max = htid | 0xFFF;
 752
 753         if (idr_alloc_u32(&ht->handle_idr, NULL, &index, max, GFP_KERNEL)) {
 754                 index = htid + 1;
 755                 if (idr_alloc_u32(&ht->handle_idr, NULL, &index, max,
 756                                  GFP_KERNEL))
 757                         index = max;
 758         }
 759
 760         return index;
 761 }
 762
 763 static const struct nla_policy u32_policy[TCA_U32_MAX + 1] = {
 764         [TCA_U32_CLASSID]       = { .type = NLA_U32 },
 765         [TCA_U32_HASH]          = { .type = NLA_U32 },
 766         [TCA_U32_LINK]          = { .type = NLA_U32 },
 767         [TCA_U32_DIVISOR]       = { .type = NLA_U32 },
 768         [TCA_U32_SEL]           = { .len = sizeof(struct tc_u32_sel) },
 769         [TCA_U32_INDEV]         = { .type = NLA_STRING, .len = IFNAMSIZ },
 770         [TCA_U32_MARK]          = { .len = sizeof(struct tc_u32_mark) },
 771         [TCA_U32_FLAGS]         = { .type = NLA_U32 },
 772 };
 773
 774 static int u32_set_parms(struct net *net, struct tcf_proto *tp,
 775                          unsigned long base, struct tc_u_hnode *ht,
 776                          struct tc_u_knode *n, struct nlattr **tb,
 777                          struct nlattr *est, bool ovr,
 778                          struct netlink_ext_ack *extack)
 779 {
 780         int err;
 781
 782         err = tcf_exts_validate(net, tp, tb, est, &n->exts, ovr, extack);
 783         if (err < 0)
 784                 return err;
 785
 786         if (tb[TCA_U32_LINK]) {
 787                 u32 handle = nla_get_u32(tb[TCA_U32_LINK]);
 788                 struct tc_u_hnode *ht_down = NULL, *ht_old;
 789
 790                 if (TC_U32_KEY(handle)) {
 791                         NL_SET_ERR_MSG_MOD(extack, "u32 Link handle must be a hash table");
 792                         return -EINVAL;
 793                 }
 794
 795                 if (handle) {
 796                         ht_down = u32_lookup_ht(ht->tp_c, handle);
 797
 798                         if (!ht_down) {
 799                                 NL_SET_ERR_MSG_MOD(extack, "Link hash table not found");
 800                                 return -EINVAL;
 801                         }
 802                         ht_down->refcnt++;
 803                 }
 804
 805                 ht_old = rtnl_dereference(n->ht_down);
 806                 rcu_assign_pointer(n->ht_down, ht_down);
 807
 808                 if (ht_old)
 809                         ht_old->refcnt--;
 810         }
 811         if (tb[TCA_U32_CLASSID]) {
 812                 n->res.classid = nla_get_u32(tb[TCA_U32_CLASSID]);
 813                 tcf_bind_filter(tp, &n->res, base);
 814         }
 815
 816 #ifdef CONFIG_NET_CLS_IND
 817         if (tb[TCA_U32_INDEV]) {
 818                 int ret;
 819                 ret = tcf_change_indev(net, tb[TCA_U32_INDEV], extack);
 820                 if (ret < 0)
 821                         return -EINVAL;
 822                 n->ifindex = ret;
 823         }
 824 #endif
 825         return 0;
 826 }
 827
 828 static void u32_replace_knode(struct tcf_proto *tp, struct tc_u_common *tp_c,
 829                               struct tc_u_knode *n)
 830 {
 831         struct tc_u_knode __rcu **ins;
 832         struct tc_u_knode *pins;
 833         struct tc_u_hnode *ht;
 834
 835         if (TC_U32_HTID(n->handle) == TC_U32_ROOT)
 836                 ht = rtnl_dereference(tp->root);
 837         else
 838                 ht = u32_lookup_ht(tp_c, TC_U32_HTID(n->handle));
 839
 840         ins = &ht->ht[TC_U32_HASH(n->handle)];
 841
 842         /* The node must always exist for it to be replaced if this is not the
 843          * case then something went very wrong elsewhere.
 844          */
 845         for (pins = rtnl_dereference(*ins); ;
 846              ins = &pins->next, pins = rtnl_dereference(*ins))
 847                 if (pins->handle == n->handle)
 848                         break;
 849
 850         idr_replace(&ht->handle_idr, n, n->handle);
 851         RCU_INIT_POINTER(n->next, pins->next);
 852         rcu_assign_pointer(*ins, n);
 853 }
 854
 855 static struct tc_u_knode *u32_init_knode(struct tcf_proto *tp,
 856                                          struct tc_u_knode *n)
 857 {
 858         struct tc_u_hnode *ht = rtnl_dereference(n->ht_down);
 859         struct tc_u32_sel *s = &n->sel;
 860         struct tc_u_knode *new;
 861
 862         new = kzalloc(sizeof(*n) + s->nkeys*sizeof(struct tc_u32_key),
 863                       GFP_KERNEL);
 864
 865         if (!new)
 866                 return NULL;
 867
 868         RCU_INIT_POINTER(new->next, n->next);
 869         new->handle = n->handle;
 870         RCU_INIT_POINTER(new->ht_up, n->ht_up);
 871
 872 #ifdef CONFIG_NET_CLS_IND
 873         new->ifindex = n->ifindex;
 874 #endif
 875         new->fshift = n->fshift;
 876         new->res = n->res;
 877         new->flags = n->flags;
 878         RCU_INIT_POINTER(new->ht_down, ht);
 879
 880 #ifdef CONFIG_CLS_U32_PERF
 881         /* Statistics may be incremented by readers during update
 882          * so we must keep them in tact. When the node is later destroyed
 883          * a special destroy call must be made to not free the pf memory.
 884          */
 885         new->pf = n->pf;
 886 #endif
 887
 888 #ifdef CONFIG_CLS_U32_MARK
 889         new->val = n->val;
 890         new->mask = n->mask;
 891         /* Similarly success statistics must be moved as pointers */
 892         new->pcpu_success = n->pcpu_success;
 893 #endif
 894         new->tp = tp;
 895         memcpy(&new->sel, s, sizeof(*s) + s->nkeys*sizeof(struct tc_u32_key));
 896
 897         if (tcf_exts_init(&new->exts, TCA_U32_ACT, TCA_U32_POLICE)) {
 898                 kfree(new);
 899                 return NULL;
 900         }
 901
 902         /* bump reference count as long as we hold pointer to structure */
 903         if (ht)
 904                 ht->refcnt++;
 905
 906         return new;
 907 }
 908
 909 static int u32_change(struct net *net, struct sk_buff *in_skb,
 910                       struct tcf_proto *tp, unsigned long base, u32 handle,
 911                       struct nlattr **tca, void **arg, bool ovr,
 912                       struct netlink_ext_ack *extack)
 913 {
 914         struct tc_u_common *tp_c = tp->data;
 915         struct tc_u_hnode *ht;
 916         struct tc_u_knode *n;
 917         struct tc_u32_sel *s;
 918         struct nlattr *opt = tca[TCA_OPTIONS];
 919         struct nlattr *tb[TCA_U32_MAX + 1];
 920         u32 htid, flags = 0;
 921         size_t sel_size;
 922         int err;
 923 #ifdef CONFIG_CLS_U32_PERF
 924         size_t size;
 925 #endif
 926
 927         if (!opt) {
 928                 if (handle) {
 929                         NL_SET_ERR_MSG_MOD(extack, "Filter handle requires options");
 930                         return -EINVAL;
 931                 } else {
 932                         return 0;
 933                 }
 934         }
 935
 936         err = nla_parse_nested(tb, TCA_U32_MAX, opt, u32_policy, extack);
 937         if (err < 0)
 938                 return err;
 939
 940         if (tb[TCA_U32_FLAGS]) {
 941                 flags = nla_get_u32(tb[TCA_U32_FLAGS]);
 942                 if (!tc_flags_valid(flags)) {
 943                         NL_SET_ERR_MSG_MOD(extack, "Invalid filter flags");
 944                         return -EINVAL;
 945                 }
 946         }
 947
 948         n = *arg;
 949         if (n) {
 950                 struct tc_u_knode *new;
 951
 952                 if (TC_U32_KEY(n->handle) == 0) {
 953                         NL_SET_ERR_MSG_MOD(extack, "Key node id cannot be zero");
 954                         return -EINVAL;
 955                 }
 956
 957                 if ((n->flags ^ flags) &
 958                     ~(TCA_CLS_FLAGS_IN_HW | TCA_CLS_FLAGS_NOT_IN_HW)) {
 959                         NL_SET_ERR_MSG_MOD(extack, "Key node flags do not match passed flags");
 960                         return -EINVAL;
 961                 }
 962
 963                 new = u32_init_knode(tp, n);
 964                 if (!new)
 965                         return -ENOMEM;
 966
 967                 err = u32_set_parms(net, tp, base,
 968                                     rtnl_dereference(n->ht_up), new, tb,
 969                                     tca[TCA_RATE], ovr, extack);
 970
 971                 if (err) {
 972                         __u32_destroy_key(new);
 973                         return err;
 974                 }
 975
 976                 err = u32_replace_hw_knode(tp, new, flags, extack);
 977                 if (err) {
 978                         __u32_destroy_key(new);
 979                         return err;
 980                 }
 981
 982                 if (!tc_in_hw(new->flags))
 983                         new->flags |= TCA_CLS_FLAGS_NOT_IN_HW;
 984
 985                 u32_replace_knode(tp, tp_c, new);
 986                 tcf_unbind_filter(tp, &n->res);
 987                 tcf_exts_get_net(&n->exts);
 988                 tcf_queue_work(&n->rwork, u32_delete_key_work);
 989                 return 0;
 990         }
 991
 992         if (tb[TCA_U32_DIVISOR]) {
 993                 unsigned int divisor = nla_get_u32(tb[TCA_U32_DIVISOR]);
 994
 995                 if (--divisor > 0x100) {
 996                         NL_SET_ERR_MSG_MOD(extack, "Exceeded maximum 256 hash buckets");
 997                         return -EINVAL;
 998                 }
 999                 if (TC_U32_KEY(handle)) {
1000                         NL_SET_ERR_MSG_MOD(extack, "Divisor can only be used on a hash table");
1001                         return -EINVAL;
1002                 }
1003                 ht = kzalloc(sizeof(*ht) + divisor*sizeof(void *), GFP_KERNEL);
1004                 if (ht == NULL)
1005                         return -ENOBUFS;
1006                 if (handle == 0) {
1007                         handle = gen_new_htid(tp->data, ht);
1008                         if (handle == 0) {
1009                                 kfree(ht);
1010                                 return -ENOMEM;
1011                         }
1012                 } else {
1013                         err = idr_alloc_u32(&tp_c->handle_idr, ht, &handle,
1014                                             handle, GFP_KERNEL);
1015                         if (err) {
1016                                 kfree(ht);
1017                                 return err;
1018                         }
1019                 }
1020                 ht->tp_c = tp_c;
1021                 ht->refcnt = 1;
1022                 ht->divisor = divisor;
1023                 ht->handle = handle;
1024                 ht->prio = tp->prio;
1025                 idr_init(&ht->handle_idr);
1026                 ht->flags = flags;
1027
1028                 err = u32_replace_hw_hnode(tp, ht, flags, extack);
1029                 if (err) {
1030                         idr_remove(&tp_c->handle_idr, handle);
1031                         kfree(ht);
1032                         return err;
1033                 }
1034
1035                 RCU_INIT_POINTER(ht->next, tp_c->hlist);
1036                 rcu_assign_pointer(tp_c->hlist, ht);
1037                 *arg = ht;
1038
1039                 return 0;
1040         }
1041
1042         if (tb[TCA_U32_HASH]) {
1043                 htid = nla_get_u32(tb[TCA_U32_HASH]);
1044                 if (TC_U32_HTID(htid) == TC_U32_ROOT) {
1045                         ht = rtnl_dereference(tp->root);
1046                         htid = ht->handle;
1047                 } else {
1048                         ht = u32_lookup_ht(tp->data, TC_U32_HTID(htid));
1049                         if (!ht) {
1050                                 NL_SET_ERR_MSG_MOD(extack, "Specified hash table not found");
1051                                 return -EINVAL;
1052                         }
1053                 }
1054         } else {
1055                 ht = rtnl_dereference(tp->root);
1056                 htid = ht->handle;
1057         }
1058
1059         if (ht->divisor < TC_U32_HASH(htid)) {
1060                 NL_SET_ERR_MSG_MOD(extack, "Specified hash table buckets exceed configured value");
1061                 return -EINVAL;
1062         }
1063
1064         if (handle) {
1065                 if (TC_U32_HTID(handle) && TC_U32_HTID(handle ^ htid)) {
1066                         NL_SET_ERR_MSG_MOD(extack, "Handle specified hash table address mismatch");
1067                         return -EINVAL;
1068                 }
1069                 handle = htid | TC_U32_NODE(handle);
1070                 err = idr_alloc_u32(&ht->handle_idr, NULL, &handle, handle,
1071                                     GFP_KERNEL);
1072                 if (err)
1073                         return err;
1074         } else
1075                 handle = gen_new_kid(ht, htid);
1076
1077         if (tb[TCA_U32_SEL] == NULL) {
1078                 NL_SET_ERR_MSG_MOD(extack, "Selector not specified");
1079                 err = -EINVAL;
1080                 goto erridr;
1081         }
1082
1083         s = nla_data(tb[TCA_U32_SEL]);
1084         sel_size = struct_size(s, keys, s->nkeys);
1085         if (nla_len(tb[TCA_U32_SEL]) < sel_size) {
1086                 err = -EINVAL;
1087                 goto erridr;
1088         }
1089
1090         n = kzalloc(offsetof(typeof(*n), sel) + sel_size, GFP_KERNEL);
1091         if (n == NULL) {
1092                 err = -ENOBUFS;
1093                 goto erridr;
1094         }
1095
1096 #ifdef CONFIG_CLS_U32_PERF
1097         size = sizeof(struct tc_u32_pcnt) + s->nkeys * sizeof(u64);
1098         n->pf = __alloc_percpu(size, __alignof__(struct tc_u32_pcnt));
1099         if (!n->pf) {
1100                 err = -ENOBUFS;
1101                 goto errfree;
1102         }
1103 #endif
1104
1105         memcpy(&n->sel, s, sel_size);
1106         RCU_INIT_POINTER(n->ht_up, ht);
1107         n->handle = handle;
1108         n->fshift = s->hmask ? ffs(ntohl(s->hmask)) - 1 : 0;
1109         n->flags = flags;
1110         n->tp = tp;
1111
1112         err = tcf_exts_init(&n->exts, TCA_U32_ACT, TCA_U32_POLICE);
1113         if (err < 0)
1114                 goto errout;
1115
1116 #ifdef CONFIG_CLS_U32_MARK
1117         n->pcpu_success = alloc_percpu(u32);
1118         if (!n->pcpu_success) {
1119                 err = -ENOMEM;
1120                 goto errout;
1121         }
1122
1123         if (tb[TCA_U32_MARK]) {
1124                 struct tc_u32_mark *mark;
1125
1126                 mark = nla_data(tb[TCA_U32_MARK]);
1127                 n->val = mark->val;
1128                 n->mask = mark->mask;
1129         }
1130 #endif
1131
1132         err = u32_set_parms(net, tp, base, ht, n, tb, tca[TCA_RATE], ovr,
1133                             extack);
1134         if (err == 0) {
1135                 struct tc_u_knode __rcu **ins;
1136                 struct tc_u_knode *pins;
1137
1138                 err = u32_replace_hw_knode(tp, n, flags, extack);
1139                 if (err)
1140                         goto errhw;
1141
1142                 if (!tc_in_hw(n->flags))
1143                         n->flags |= TCA_CLS_FLAGS_NOT_IN_HW;
1144
1145                 ins = &ht->ht[TC_U32_HASH(handle)];
1146                 for (pins = rtnl_dereference(*ins); pins;
1147                      ins = &pins->next, pins = rtnl_dereference(*ins))
1148                         if (TC_U32_NODE(handle) < TC_U32_NODE(pins->handle))
1149                                 break;
1150
1151                 RCU_INIT_POINTER(n->next, pins);
1152                 rcu_assign_pointer(*ins, n);
1153                 *arg = n;
1154                 return 0;
1155         }
1156
1157 errhw:
1158 #ifdef CONFIG_CLS_U32_MARK
1159         free_percpu(n->pcpu_success);
1160 #endif
1161
1162 errout:
1163         tcf_exts_destroy(&n->exts);
1164 #ifdef CONFIG_CLS_U32_PERF
1165 errfree:
1166         free_percpu(n->pf);
1167 #endif
1168         kfree(n);
1169 erridr:
1170         idr_remove(&ht->handle_idr, handle);
1171         return err;
1172 }
1173
1174 static void u32_walk(struct tcf_proto *tp, struct tcf_walker *arg)
1175 {
1176         struct tc_u_common *tp_c = tp->data;
1177         struct tc_u_hnode *ht;
1178         struct tc_u_knode *n;
1179         unsigned int h;
1180
1181         if (arg->stop)
1182                 return;
1183
1184         for (ht = rtnl_dereference(tp_c->hlist);
1185              ht;
1186              ht = rtnl_dereference(ht->next)) {
1187                 if (ht->prio != tp->prio)
1188                         continue;
1189                 if (arg->count >= arg->skip) {
1190                         if (arg->fn(tp, ht, arg) < 0) {
1191                                 arg->stop = 1;
1192                                 return;
1193                         }
1194                 }
1195                 arg->count++;
1196                 for (h = 0; h <= ht->divisor; h++) {
1197                         for (n = rtnl_dereference(ht->ht[h]);
1198                              n;
1199                              n = rtnl_dereference(n->next)) {
1200                                 if (arg->count < arg->skip) {
1201                                         arg->count++;
1202                                         continue;
1203                                 }
1204                                 if (arg->fn(tp, n, arg) < 0) {
1205                                         arg->stop = 1;
1206                                         return;
1207                                 }
1208                                 arg->count++;
1209                         }
1210                 }
1211         }
1212 }
1213
1214 static int u32_reoffload_hnode(struct tcf_proto *tp, struct tc_u_hnode *ht,
1215                                bool add, tc_setup_cb_t *cb, void *cb_priv,
1216                                struct netlink_ext_ack *extack)
1217 {
1218         struct tc_cls_u32_offload cls_u32 = {};
1219         int err;
1220
1221         tc_cls_common_offload_init(&cls_u32.common, tp, ht->flags, extack);
1222         cls_u32.command = add ? TC_CLSU32_NEW_HNODE : TC_CLSU32_DELETE_HNODE;
1223         cls_u32.hnode.divisor = ht->divisor;
1224         cls_u32.hnode.handle = ht->handle;
1225         cls_u32.hnode.prio = ht->prio;
1226
1227         err = cb(TC_SETUP_CLSU32, &cls_u32, cb_priv);
1228         if (err && add && tc_skip_sw(ht->flags))
1229                 return err;
1230
1231         return 0;
1232 }
1233
1234 static int u32_reoffload_knode(struct tcf_proto *tp, struct tc_u_knode *n,
1235                                bool add, tc_setup_cb_t *cb, void *cb_priv,
1236                                struct netlink_ext_ack *extack)
1237 {
1238         struct tc_u_hnode *ht = rtnl_dereference(n->ht_down);
1239         struct tcf_block *block = tp->chain->block;
1240         struct tc_cls_u32_offload cls_u32 = {};
1241         int err;
1242
1243         tc_cls_common_offload_init(&cls_u32.common, tp, n->flags, extack);
1244         cls_u32.command = add ?
1245                 TC_CLSU32_REPLACE_KNODE : TC_CLSU32_DELETE_KNODE;
1246         cls_u32.knode.handle = n->handle;
1247
1248         if (add) {
1249                 cls_u32.knode.fshift = n->fshift;
1250 #ifdef CONFIG_CLS_U32_MARK
1251                 cls_u32.knode.val = n->val;
1252                 cls_u32.knode.mask = n->mask;
1253 #else
1254                 cls_u32.knode.val = 0;
1255                 cls_u32.knode.mask = 0;
1256 #endif
1257                 cls_u32.knode.sel = &n->sel;
1258                 cls_u32.knode.exts = &n->exts;
1259                 if (n->ht_down)
1260                         cls_u32.knode.link_handle = ht->handle;
1261         }
1262
1263         err = cb(TC_SETUP_CLSU32, &cls_u32, cb_priv);
1264         if (err) {
1265                 if (add && tc_skip_sw(n->flags))
1266                         return err;
1267                 return 0;
1268         }
1269
1270         tc_cls_offload_cnt_update(block, &n->in_hw_count, &n->flags, add);
1271
1272         return 0;
1273 }
1274
1275 static int u32_reoffload(struct tcf_proto *tp, bool add, tc_setup_cb_t *cb,
1276                          void *cb_priv, struct netlink_ext_ack *extack)
1277 {
1278         struct tc_u_common *tp_c = tp->data;
1279         struct tc_u_hnode *ht;
1280         struct tc_u_knode *n;
1281         unsigned int h;
1282         int err;
1283
1284         for (ht = rtnl_dereference(tp_c->hlist);
1285              ht;
1286              ht = rtnl_dereference(ht->next)) {
1287                 if (ht->prio != tp->prio)
1288                         continue;
1289
1290                 /* When adding filters to a new dev, try to offload the
1291                  * hashtable first. When removing, do the filters before the
1292                  * hashtable.
1293                  */
1294                 if (add && !tc_skip_hw(ht->flags)) {
1295                         err = u32_reoffload_hnode(tp, ht, add, cb, cb_priv,
1296                                                   extack);
1297                         if (err)
1298                                 return err;
1299                 }
1300
1301                 for (h = 0; h <= ht->divisor; h++) {
1302                         for (n = rtnl_dereference(ht->ht[h]);
1303                              n;
1304                              n = rtnl_dereference(n->next)) {
1305                                 if (tc_skip_hw(n->flags))
1306                                         continue;
1307
1308                                 err = u32_reoffload_knode(tp, n, add, cb,
1309                                                           cb_priv, extack);
1310                                 if (err)
1311                                         return err;
1312                         }
1313                 }
1314
1315                 if (!add && !tc_skip_hw(ht->flags))
1316                         u32_reoffload_hnode(tp, ht, add, cb, cb_priv, extack);
1317         }
1318
1319         return 0;
1320 }
1321
1322 static void u32_bind_class(void *fh, u32 classid, unsigned long cl, void *q,
1323                            unsigned long base)
1324 {
1325         struct tc_u_knode *n = fh;
1326
1327         if (n && n->res.classid == classid) {
1328                 if (cl)
1329                         __tcf_bind_filter(q, &n->res, base);
1330                 else
1331                         __tcf_unbind_filter(q, &n->res);
1332         }
1333 }
1334
1335 static int u32_dump(struct net *net, struct tcf_proto *tp, void *fh,
1336                     struct sk_buff *skb, struct tcmsg *t)
1337 {
1338         struct tc_u_knode *n = fh;
1339         struct tc_u_hnode *ht_up, *ht_down;
1340         struct nlattr *nest;
1341
1342         if (n == NULL)
1343                 return skb->len;
1344
1345         t->tcm_handle = n->handle;
1346
1347         nest = nla_nest_start(skb, TCA_OPTIONS);
1348         if (nest == NULL)
1349                 goto nla_put_failure;
1350
1351         if (TC_U32_KEY(n->handle) == 0) {
1352                 struct tc_u_hnode *ht = fh;
1353                 u32 divisor = ht->divisor + 1;
1354
1355                 if (nla_put_u32(skb, TCA_U32_DIVISOR, divisor))
1356                         goto nla_put_failure;
1357         } else {
1358 #ifdef CONFIG_CLS_U32_PERF
1359                 struct tc_u32_pcnt *gpf;
1360                 int cpu;
1361 #endif
1362
1363                 if (nla_put(skb, TCA_U32_SEL,
1364                             sizeof(n->sel) + n->sel.nkeys*sizeof(struct tc_u32_key),
1365                             &n->sel))
1366                         goto nla_put_failure;
1367
1368                 ht_up = rtnl_dereference(n->ht_up);
1369                 if (ht_up) {
1370                         u32 htid = n->handle & 0xFFFFF000;
1371                         if (nla_put_u32(skb, TCA_U32_HASH, htid))
1372                                 goto nla_put_failure;
1373                 }
1374                 if (n->res.classid &&
1375                     nla_put_u32(skb, TCA_U32_CLASSID, n->res.classid))
1376                         goto nla_put_failure;
1377
1378                 ht_down = rtnl_dereference(n->ht_down);
1379                 if (ht_down &&
1380                     nla_put_u32(skb, TCA_U32_LINK, ht_down->handle))
1381                         goto nla_put_failure;
1382
1383                 if (n->flags && nla_put_u32(skb, TCA_U32_FLAGS, n->flags))
1384                         goto nla_put_failure;
1385
1386 #ifdef CONFIG_CLS_U32_MARK
1387                 if ((n->val || n->mask)) {
1388                         struct tc_u32_mark mark = {.val = n->val,
1389                                                    .mask = n->mask,
1390                                                    .success = 0};
1391                         int cpum;
1392
1393                         for_each_possible_cpu(cpum) {
1394                                 __u32 cnt = *per_cpu_ptr(n->pcpu_success, cpum);
1395
1396                                 mark.success += cnt;
1397                         }
1398
1399                         if (nla_put(skb, TCA_U32_MARK, sizeof(mark), &mark))
1400                                 goto nla_put_failure;
1401                 }
1402 #endif
1403
1404                 if (tcf_exts_dump(skb, &n->exts) < 0)
1405                         goto nla_put_failure;
1406
1407 #ifdef CONFIG_NET_CLS_IND
1408                 if (n->ifindex) {
1409                         struct net_device *dev;
1410                         dev = __dev_get_by_index(net, n->ifindex);
1411                         if (dev && nla_put_string(skb, TCA_U32_INDEV, dev->name))
1412                                 goto nla_put_failure;
1413                 }
1414 #endif
1415 #ifdef CONFIG_CLS_U32_PERF
1416                 gpf = kzalloc(sizeof(struct tc_u32_pcnt) +
1417                               n->sel.nkeys * sizeof(u64),
1418                               GFP_KERNEL);
1419                 if (!gpf)
1420                         goto nla_put_failure;
1421
1422                 for_each_possible_cpu(cpu) {
1423                         int i;
1424                         struct tc_u32_pcnt *pf = per_cpu_ptr(n->pf, cpu);
1425
1426                         gpf->rcnt += pf->rcnt;
1427                         gpf->rhit += pf->rhit;
1428                         for (i = 0; i < n->sel.nkeys; i++)
1429                                 gpf->kcnts[i] += pf->kcnts[i];
1430                 }
1431
1432                 if (nla_put_64bit(skb, TCA_U32_PCNT,
1433                                   sizeof(struct tc_u32_pcnt) +
1434                                   n->sel.nkeys * sizeof(u64),
1435                                   gpf, TCA_U32_PAD)) {
1436                         kfree(gpf);
1437                         goto nla_put_failure;
1438                 }
1439                 kfree(gpf);
1440 #endif
1441         }
1442
1443         nla_nest_end(skb, nest);
1444
1445         if (TC_U32_KEY(n->handle))
1446                 if (tcf_exts_dump_stats(skb, &n->exts) < 0)
1447                         goto nla_put_failure;
1448         return skb->len;
1449
1450 nla_put_failure:
1451         nla_nest_cancel(skb, nest);
1452         return -1;
1453 }
1454
1455 static struct tcf_proto_ops cls_u32_ops __read_mostly = {
1456         .kind           =       "u32",
1457         .classify       =       u32_classify,
1458         .init           =       u32_init,
1459         .destroy        =       u32_destroy,
1460         .get            =       u32_get,
1461         .change         =       u32_change,
1462         .delete         =       u32_delete,
1463         .walk           =       u32_walk,
1464         .reoffload      =       u32_reoffload,
1465         .dump           =       u32_dump,
1466         .bind_class     =       u32_bind_class,
1467         .owner          =       THIS_MODULE,
1468 };
1469
1470 static int __init init_u32(void)
1471 {
1472         int i, ret;
1473
1474         pr_info("u32 classifier\n");
1475 #ifdef CONFIG_CLS_U32_PERF
1476         pr_info("    Performance counters on\n");
1477 #endif
1478 #ifdef CONFIG_NET_CLS_IND
1479         pr_info("    input device check on\n");
1480 #endif
1481 #ifdef CONFIG_NET_CLS_ACT
1482         pr_info("    Actions configured\n");
1483 #endif
1484         tc_u_common_hash = kvmalloc_array(U32_HASH_SIZE,
1485                                           sizeof(struct hlist_head),
1486                                           GFP_KERNEL);
1487         if (!tc_u_common_hash)
1488                 return -ENOMEM;
1489
1490         for (i = 0; i < U32_HASH_SIZE; i++)
1491                 INIT_HLIST_HEAD(&tc_u_common_hash[i]);
1492
1493         ret = register_tcf_proto_ops(&cls_u32_ops);
1494         if (ret)
1495                 kvfree(tc_u_common_hash);
1496         return ret;
1497 }
1498
1499 static void __exit exit_u32(void)
1500 {
1501         unregister_tcf_proto_ops(&cls_u32_ops);
1502         kvfree(tc_u_common_hash);
1503 }
1504
1505 module_init(init_u32)
1506 module_exit(exit_u32)
1507 MODULE_LICENSE("GPL");