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, <[email protected]>
  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         rcu_assign_pointer(tp->root, root_ht);
 402         tp->data = tp_c;
 403         return 0;
 404 }
 405
 406 static int u32_destroy_key(struct tcf_proto *tp, struct tc_u_knode *n,
 407                            bool free_pf)
 408 {
 409         struct tc_u_hnode *ht = rtnl_dereference(n->ht_down);
 410
 411         tcf_exts_destroy(&n->exts);
 412         tcf_exts_put_net(&n->exts);
 413         if (ht && --ht->refcnt == 0)
 414                 kfree(ht);
 415 #ifdef CONFIG_CLS_U32_PERF
 416         if (free_pf)
 417                 free_percpu(n->pf);
 418 #endif
 419 #ifdef CONFIG_CLS_U32_MARK
 420         if (free_pf)
 421                 free_percpu(n->pcpu_success);
 422 #endif
 423         kfree(n);
 424         return 0;
 425 }
 426
 427 /* u32_delete_key_rcu should be called when free'ing a copied
 428  * version of a tc_u_knode obtained from u32_init_knode(). When
 429  * copies are obtained from u32_init_knode() the statistics are
 430  * shared between the old and new copies to allow readers to
 431  * continue to update the statistics during the copy. To support
 432  * this the u32_delete_key_rcu variant does not free the percpu
 433  * statistics.
 434  */
 435 static void u32_delete_key_work(struct work_struct *work)
 436 {
 437         struct tc_u_knode *key = container_of(to_rcu_work(work),
 438                                               struct tc_u_knode,
 439                                               rwork);
 440         rtnl_lock();
 441         u32_destroy_key(key->tp, key, false);
 442         rtnl_unlock();
 443 }
 444
 445 /* u32_delete_key_freepf_rcu is the rcu callback variant
 446  * that free's the entire structure including the statistics
 447  * percpu variables. Only use this if the key is not a copy
 448  * returned by u32_init_knode(). See u32_delete_key_rcu()
 449  * for the variant that should be used with keys return from
 450  * u32_init_knode()
 451  */
 452 static void u32_delete_key_freepf_work(struct work_struct *work)
 453 {
 454         struct tc_u_knode *key = container_of(to_rcu_work(work),
 455                                               struct tc_u_knode,
 456                                               rwork);
 457         rtnl_lock();
 458         u32_destroy_key(key->tp, key, true);
 459         rtnl_unlock();
 460 }
 461
 462 static int u32_delete_key(struct tcf_proto *tp, struct tc_u_knode *key)
 463 {
 464         struct tc_u_knode __rcu **kp;
 465         struct tc_u_knode *pkp;
 466         struct tc_u_hnode *ht = rtnl_dereference(key->ht_up);
 467
 468         if (ht) {
 469                 kp = &ht->ht[TC_U32_HASH(key->handle)];
 470                 for (pkp = rtnl_dereference(*kp); pkp;
 471                      kp = &pkp->next, pkp = rtnl_dereference(*kp)) {
 472                         if (pkp == key) {
 473                                 RCU_INIT_POINTER(*kp, key->next);
 474
 475                                 tcf_unbind_filter(tp, &key->res);
 476                                 idr_remove(&ht->handle_idr, key->handle);
 477                                 tcf_exts_get_net(&key->exts);
 478                                 tcf_queue_work(&key->rwork, u32_delete_key_freepf_work);
 479                                 return 0;
 480                         }
 481                 }
 482         }
 483         WARN_ON(1);
 484         return 0;
 485 }
 486
 487 static void u32_clear_hw_hnode(struct tcf_proto *tp, struct tc_u_hnode *h,
 488                                struct netlink_ext_ack *extack)
 489 {
 490         struct tcf_block *block = tp->chain->block;
 491         struct tc_cls_u32_offload cls_u32 = {};
 492
 493         tc_cls_common_offload_init(&cls_u32.common, tp, h->flags, extack);
 494         cls_u32.command = TC_CLSU32_DELETE_HNODE;
 495         cls_u32.hnode.divisor = h->divisor;
 496         cls_u32.hnode.handle = h->handle;
 497         cls_u32.hnode.prio = h->prio;
 498
 499         tc_setup_cb_call(block, NULL, TC_SETUP_CLSU32, &cls_u32, false);
 500 }
 501
 502 static int u32_replace_hw_hnode(struct tcf_proto *tp, struct tc_u_hnode *h,
 503                                 u32 flags, struct netlink_ext_ack *extack)
 504 {
 505         struct tcf_block *block = tp->chain->block;
 506         struct tc_cls_u32_offload cls_u32 = {};
 507         bool skip_sw = tc_skip_sw(flags);
 508         bool offloaded = false;
 509         int err;
 510
 511         tc_cls_common_offload_init(&cls_u32.common, tp, flags, extack);
 512         cls_u32.command = TC_CLSU32_NEW_HNODE;
 513         cls_u32.hnode.divisor = h->divisor;
 514         cls_u32.hnode.handle = h->handle;
 515         cls_u32.hnode.prio = h->prio;
 516
 517         err = tc_setup_cb_call(block, NULL, TC_SETUP_CLSU32, &cls_u32, skip_sw);
 518         if (err < 0) {
 519                 u32_clear_hw_hnode(tp, h, NULL);
 520                 return err;
 521         } else if (err > 0) {
 522                 offloaded = true;
 523         }
 524
 525         if (skip_sw && !offloaded)
 526                 return -EINVAL;
 527
 528         return 0;
 529 }
 530
 531 static void u32_remove_hw_knode(struct tcf_proto *tp, struct tc_u_knode *n,
 532                                 struct netlink_ext_ack *extack)
 533 {
 534         struct tcf_block *block = tp->chain->block;
 535         struct tc_cls_u32_offload cls_u32 = {};
 536
 537         tc_cls_common_offload_init(&cls_u32.common, tp, n->flags, extack);
 538         cls_u32.command = TC_CLSU32_DELETE_KNODE;
 539         cls_u32.knode.handle = n->handle;
 540
 541         tc_setup_cb_call(block, NULL, TC_SETUP_CLSU32, &cls_u32, false);
 542         tcf_block_offload_dec(block, &n->flags);
 543 }
 544
 545 static int u32_replace_hw_knode(struct tcf_proto *tp, struct tc_u_knode *n,
 546                                 u32 flags, struct netlink_ext_ack *extack)
 547 {
 548         struct tc_u_hnode *ht = rtnl_dereference(n->ht_down);
 549         struct tcf_block *block = tp->chain->block;
 550         struct tc_cls_u32_offload cls_u32 = {};
 551         bool skip_sw = tc_skip_sw(flags);
 552         int err;
 553
 554         tc_cls_common_offload_init(&cls_u32.common, tp, flags, extack);
 555         cls_u32.command = TC_CLSU32_REPLACE_KNODE;
 556         cls_u32.knode.handle = n->handle;
 557         cls_u32.knode.fshift = n->fshift;
 558 #ifdef CONFIG_CLS_U32_MARK
 559         cls_u32.knode.val = n->val;
 560         cls_u32.knode.mask = n->mask;
 561 #else
 562         cls_u32.knode.val = 0;
 563         cls_u32.knode.mask = 0;
 564 #endif
 565         cls_u32.knode.sel = &n->sel;
 566         cls_u32.knode.exts = &n->exts;
 567         if (n->ht_down)
 568                 cls_u32.knode.link_handle = ht->handle;
 569
 570         err = tc_setup_cb_call(block, NULL, TC_SETUP_CLSU32, &cls_u32, skip_sw);
 571         if (err < 0) {
 572                 u32_remove_hw_knode(tp, n, NULL);
 573                 return err;
 574         } else if (err > 0) {
 575                 n->in_hw_count = err;
 576                 tcf_block_offload_inc(block, &n->flags);
 577         }
 578
 579         if (skip_sw && !(n->flags & TCA_CLS_FLAGS_IN_HW))
 580                 return -EINVAL;
 581
 582         return 0;
 583 }
 584
 585 static void u32_clear_hnode(struct tcf_proto *tp, struct tc_u_hnode *ht,
 586                             struct netlink_ext_ack *extack)
 587 {
 588         struct tc_u_knode *n;
 589         unsigned int h;
 590
 591         for (h = 0; h <= ht->divisor; h++) {
 592                 while ((n = rtnl_dereference(ht->ht[h])) != NULL) {
 593                         RCU_INIT_POINTER(ht->ht[h],
 594                                          rtnl_dereference(n->next));
 595                         tcf_unbind_filter(tp, &n->res);
 596                         u32_remove_hw_knode(tp, n, extack);
 597                         idr_remove(&ht->handle_idr, n->handle);
 598                         if (tcf_exts_get_net(&n->exts))
 599                                 tcf_queue_work(&n->rwork, u32_delete_key_freepf_work);
 600                         else
 601                                 u32_destroy_key(n->tp, n, true);
 602                 }
 603         }
 604 }
 605
 606 static int u32_destroy_hnode(struct tcf_proto *tp, struct tc_u_hnode *ht,
 607                              struct netlink_ext_ack *extack)
 608 {
 609         struct tc_u_common *tp_c = tp->data;
 610         struct tc_u_hnode __rcu **hn;
 611         struct tc_u_hnode *phn;
 612
 613         WARN_ON(ht->refcnt);
 614
 615         u32_clear_hnode(tp, ht, extack);
 616
 617         hn = &tp_c->hlist;
 618         for (phn = rtnl_dereference(*hn);
 619              phn;
 620              hn = &phn->next, phn = rtnl_dereference(*hn)) {
 621                 if (phn == ht) {
 622                         u32_clear_hw_hnode(tp, ht, extack);
 623                         idr_destroy(&ht->handle_idr);
 624                         idr_remove(&tp_c->handle_idr, ht->handle);
 625                         RCU_INIT_POINTER(*hn, ht->next);
 626                         kfree_rcu(ht, rcu);
 627                         return 0;
 628                 }
 629         }
 630
 631         return -ENOENT;
 632 }
 633
 634 static bool ht_empty(struct tc_u_hnode *ht)
 635 {
 636         unsigned int h;
 637
 638         for (h = 0; h <= ht->divisor; h++)
 639                 if (rcu_access_pointer(ht->ht[h]))
 640                         return false;
 641
 642         return true;
 643 }
 644
 645 static void u32_destroy(struct tcf_proto *tp, struct netlink_ext_ack *extack)
 646 {
 647         struct tc_u_common *tp_c = tp->data;
 648         struct tc_u_hnode *root_ht = rtnl_dereference(tp->root);
 649
 650         WARN_ON(root_ht == NULL);
 651
 652         if (root_ht && --root_ht->refcnt == 0)
 653                 u32_destroy_hnode(tp, root_ht, extack);
 654
 655         if (--tp_c->refcnt == 0) {
 656                 struct tc_u_hnode *ht;
 657
 658                 hlist_del(&tp_c->hnode);
 659
 660                 while ((ht = rtnl_dereference(tp_c->hlist)) != NULL) {
 661                         u32_clear_hnode(tp, ht, extack);
 662                         RCU_INIT_POINTER(tp_c->hlist, ht->next);
 663
 664                         /* u32_destroy_key() will later free ht for us, if it's
 665                          * still referenced by some knode
 666                          */
 667                         if (--ht->refcnt == 0)
 668                                 kfree_rcu(ht, rcu);
 669                 }
 670
 671                 idr_destroy(&tp_c->handle_idr);
 672                 kfree(tp_c);
 673         }
 674
 675         tp->data = NULL;
 676 }
 677
 678 static int u32_delete(struct tcf_proto *tp, void *arg, bool *last,
 679                       struct netlink_ext_ack *extack)
 680 {
 681         struct tc_u_hnode *ht = arg;
 682         struct tc_u_hnode *root_ht = rtnl_dereference(tp->root);
 683         struct tc_u_common *tp_c = tp->data;
 684         int ret = 0;
 685
 686         if (ht == NULL)
 687                 goto out;
 688
 689         if (TC_U32_KEY(ht->handle)) {
 690                 u32_remove_hw_knode(tp, (struct tc_u_knode *)ht, extack);
 691                 ret = u32_delete_key(tp, (struct tc_u_knode *)ht);
 692                 goto out;
 693         }
 694
 695         if (root_ht == ht) {
 696                 NL_SET_ERR_MSG_MOD(extack, "Not allowed to delete root node");
 697                 return -EINVAL;
 698         }
 699
 700         if (ht->refcnt == 1) {
 701                 ht->refcnt--;
 702                 u32_destroy_hnode(tp, ht, extack);
 703         } else {
 704                 NL_SET_ERR_MSG_MOD(extack, "Can not delete in-use filter");
 705                 return -EBUSY;
 706         }
 707
 708 out:
 709         *last = true;
 710         if (root_ht) {
 711                 if (root_ht->refcnt > 1) {
 712                         *last = false;
 713                         goto ret;
 714                 }
 715                 if (root_ht->refcnt == 1) {
 716                         if (!ht_empty(root_ht)) {
 717                                 *last = false;
 718                                 goto ret;
 719                         }
 720                 }
 721         }
 722
 723         if (tp_c->refcnt > 1) {
 724                 *last = false;
 725                 goto ret;
 726         }
 727
 728         if (tp_c->refcnt == 1) {
 729                 struct tc_u_hnode *ht;
 730
 731                 for (ht = rtnl_dereference(tp_c->hlist);
 732                      ht;
 733                      ht = rtnl_dereference(ht->next))
 734                         if (!ht_empty(ht)) {
 735                                 *last = false;
 736                                 break;
 737                         }
 738         }
 739
 740 ret:
 741         return ret;
 742 }
 743
 744 static u32 gen_new_kid(struct tc_u_hnode *ht, u32 htid)
 745 {
 746         u32 index = htid | 0x800;
 747         u32 max = htid | 0xFFF;
 748
 749         if (idr_alloc_u32(&ht->handle_idr, NULL, &index, max, GFP_KERNEL)) {
 750                 index = htid + 1;
 751                 if (idr_alloc_u32(&ht->handle_idr, NULL, &index, max,
 752                                  GFP_KERNEL))
 753                         index = max;
 754         }
 755
 756         return index;
 757 }
 758
 759 static const struct nla_policy u32_policy[TCA_U32_MAX + 1] = {
 760         [TCA_U32_CLASSID]       = { .type = NLA_U32 },
 761         [TCA_U32_HASH]          = { .type = NLA_U32 },
 762         [TCA_U32_LINK]          = { .type = NLA_U32 },
 763         [TCA_U32_DIVISOR]       = { .type = NLA_U32 },
 764         [TCA_U32_SEL]           = { .len = sizeof(struct tc_u32_sel) },
 765         [TCA_U32_INDEV]         = { .type = NLA_STRING, .len = IFNAMSIZ },
 766         [TCA_U32_MARK]          = { .len = sizeof(struct tc_u32_mark) },
 767         [TCA_U32_FLAGS]         = { .type = NLA_U32 },
 768 };
 769
 770 static int u32_set_parms(struct net *net, struct tcf_proto *tp,
 771                          unsigned long base, struct tc_u_hnode *ht,
 772                          struct tc_u_knode *n, struct nlattr **tb,
 773                          struct nlattr *est, bool ovr,
 774                          struct netlink_ext_ack *extack)
 775 {
 776         int err;
 777
 778         err = tcf_exts_validate(net, tp, tb, est, &n->exts, ovr, extack);
 779         if (err < 0)
 780                 return err;
 781
 782         if (tb[TCA_U32_LINK]) {
 783                 u32 handle = nla_get_u32(tb[TCA_U32_LINK]);
 784                 struct tc_u_hnode *ht_down = NULL, *ht_old;
 785
 786                 if (TC_U32_KEY(handle)) {
 787                         NL_SET_ERR_MSG_MOD(extack, "u32 Link handle must be a hash table");
 788                         return -EINVAL;
 789                 }
 790
 791                 if (handle) {
 792                         ht_down = u32_lookup_ht(ht->tp_c, handle);
 793
 794                         if (!ht_down) {
 795                                 NL_SET_ERR_MSG_MOD(extack, "Link hash table not found");
 796                                 return -EINVAL;
 797                         }
 798                         ht_down->refcnt++;
 799                 }
 800
 801                 ht_old = rtnl_dereference(n->ht_down);
 802                 rcu_assign_pointer(n->ht_down, ht_down);
 803
 804                 if (ht_old)
 805                         ht_old->refcnt--;
 806         }
 807         if (tb[TCA_U32_CLASSID]) {
 808                 n->res.classid = nla_get_u32(tb[TCA_U32_CLASSID]);
 809                 tcf_bind_filter(tp, &n->res, base);
 810         }
 811
 812 #ifdef CONFIG_NET_CLS_IND
 813         if (tb[TCA_U32_INDEV]) {
 814                 int ret;
 815                 ret = tcf_change_indev(net, tb[TCA_U32_INDEV], extack);
 816                 if (ret < 0)
 817                         return -EINVAL;
 818                 n->ifindex = ret;
 819         }
 820 #endif
 821         return 0;
 822 }
 823
 824 static void u32_replace_knode(struct tcf_proto *tp, struct tc_u_common *tp_c,
 825                               struct tc_u_knode *n)
 826 {
 827         struct tc_u_knode __rcu **ins;
 828         struct tc_u_knode *pins;
 829         struct tc_u_hnode *ht;
 830
 831         if (TC_U32_HTID(n->handle) == TC_U32_ROOT)
 832                 ht = rtnl_dereference(tp->root);
 833         else
 834                 ht = u32_lookup_ht(tp_c, TC_U32_HTID(n->handle));
 835
 836         ins = &ht->ht[TC_U32_HASH(n->handle)];
 837
 838         /* The node must always exist for it to be replaced if this is not the
 839          * case then something went very wrong elsewhere.
 840          */
 841         for (pins = rtnl_dereference(*ins); ;
 842              ins = &pins->next, pins = rtnl_dereference(*ins))
 843                 if (pins->handle == n->handle)
 844                         break;
 845
 846         idr_replace(&ht->handle_idr, n, n->handle);
 847         RCU_INIT_POINTER(n->next, pins->next);
 848         rcu_assign_pointer(*ins, n);
 849 }
 850
 851 static struct tc_u_knode *u32_init_knode(struct tcf_proto *tp,
 852                                          struct tc_u_knode *n)
 853 {
 854         struct tc_u_hnode *ht = rtnl_dereference(n->ht_down);
 855         struct tc_u32_sel *s = &n->sel;
 856         struct tc_u_knode *new;
 857
 858         new = kzalloc(sizeof(*n) + s->nkeys*sizeof(struct tc_u32_key),
 859                       GFP_KERNEL);
 860
 861         if (!new)
 862                 return NULL;
 863
 864         RCU_INIT_POINTER(new->next, n->next);
 865         new->handle = n->handle;
 866         RCU_INIT_POINTER(new->ht_up, n->ht_up);
 867
 868 #ifdef CONFIG_NET_CLS_IND
 869         new->ifindex = n->ifindex;
 870 #endif
 871         new->fshift = n->fshift;
 872         new->res = n->res;
 873         new->flags = n->flags;
 874         RCU_INIT_POINTER(new->ht_down, ht);
 875
 876         /* bump reference count as long as we hold pointer to structure */
 877         if (ht)
 878                 ht->refcnt++;
 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         return new;
 903 }
 904
 905 static int u32_change(struct net *net, struct sk_buff *in_skb,
 906                       struct tcf_proto *tp, unsigned long base, u32 handle,
 907                       struct nlattr **tca, void **arg, bool ovr,
 908                       struct netlink_ext_ack *extack)
 909 {
 910         struct tc_u_common *tp_c = tp->data;
 911         struct tc_u_hnode *ht;
 912         struct tc_u_knode *n;
 913         struct tc_u32_sel *s;
 914         struct nlattr *opt = tca[TCA_OPTIONS];
 915         struct nlattr *tb[TCA_U32_MAX + 1];
 916         u32 htid, flags = 0;
 917         size_t sel_size;
 918         int err;
 919 #ifdef CONFIG_CLS_U32_PERF
 920         size_t size;
 921 #endif
 922
 923         if (!opt) {
 924                 if (handle) {
 925                         NL_SET_ERR_MSG_MOD(extack, "Filter handle requires options");
 926                         return -EINVAL;
 927                 } else {
 928                         return 0;
 929                 }
 930         }
 931
 932         err = nla_parse_nested(tb, TCA_U32_MAX, opt, u32_policy, extack);
 933         if (err < 0)
 934                 return err;
 935
 936         if (tb[TCA_U32_FLAGS]) {
 937                 flags = nla_get_u32(tb[TCA_U32_FLAGS]);
 938                 if (!tc_flags_valid(flags)) {
 939                         NL_SET_ERR_MSG_MOD(extack, "Invalid filter flags");
 940                         return -EINVAL;
 941                 }
 942         }
 943
 944         n = *arg;
 945         if (n) {
 946                 struct tc_u_knode *new;
 947
 948                 if (TC_U32_KEY(n->handle) == 0) {
 949                         NL_SET_ERR_MSG_MOD(extack, "Key node id cannot be zero");
 950                         return -EINVAL;
 951                 }
 952
 953                 if ((n->flags ^ flags) &
 954                     ~(TCA_CLS_FLAGS_IN_HW | TCA_CLS_FLAGS_NOT_IN_HW)) {
 955                         NL_SET_ERR_MSG_MOD(extack, "Key node flags do not match passed flags");
 956                         return -EINVAL;
 957                 }
 958
 959                 new = u32_init_knode(tp, n);
 960                 if (!new)
 961                         return -ENOMEM;
 962
 963                 err = u32_set_parms(net, tp, base,
 964                                     rtnl_dereference(n->ht_up), new, tb,
 965                                     tca[TCA_RATE], ovr, extack);
 966
 967                 if (err) {
 968                         u32_destroy_key(tp, new, false);
 969                         return err;
 970                 }
 971
 972                 err = u32_replace_hw_knode(tp, new, flags, extack);
 973                 if (err) {
 974                         u32_destroy_key(tp, new, false);
 975                         return err;
 976                 }
 977
 978                 if (!tc_in_hw(new->flags))
 979                         new->flags |= TCA_CLS_FLAGS_NOT_IN_HW;
 980
 981                 u32_replace_knode(tp, tp_c, new);
 982                 tcf_unbind_filter(tp, &n->res);
 983                 tcf_exts_get_net(&n->exts);
 984                 tcf_queue_work(&n->rwork, u32_delete_key_work);
 985                 return 0;
 986         }
 987
 988         if (tb[TCA_U32_DIVISOR]) {
 989                 unsigned int divisor = nla_get_u32(tb[TCA_U32_DIVISOR]);
 990
 991                 if (--divisor > 0x100) {
 992                         NL_SET_ERR_MSG_MOD(extack, "Exceeded maximum 256 hash buckets");
 993                         return -EINVAL;
 994                 }
 995                 if (TC_U32_KEY(handle)) {
 996                         NL_SET_ERR_MSG_MOD(extack, "Divisor can only be used on a hash table");
 997                         return -EINVAL;
 998                 }
 999                 ht = kzalloc(sizeof(*ht) + divisor*sizeof(void *), GFP_KERNEL);
1000                 if (ht == NULL)
1001                         return -ENOBUFS;
1002                 if (handle == 0) {
1003                         handle = gen_new_htid(tp->data, ht);
1004                         if (handle == 0) {
1005                                 kfree(ht);
1006                                 return -ENOMEM;
1007                         }
1008                 } else {
1009                         err = idr_alloc_u32(&tp_c->handle_idr, ht, &handle,
1010                                             handle, GFP_KERNEL);
1011                         if (err) {
1012                                 kfree(ht);
1013                                 return err;
1014                         }
1015                 }
1016                 ht->tp_c = tp_c;
1017                 ht->refcnt = 1;
1018                 ht->divisor = divisor;
1019                 ht->handle = handle;
1020                 ht->prio = tp->prio;
1021                 idr_init(&ht->handle_idr);
1022                 ht->flags = flags;
1023
1024                 err = u32_replace_hw_hnode(tp, ht, flags, extack);
1025                 if (err) {
1026                         idr_remove(&tp_c->handle_idr, handle);
1027                         kfree(ht);
1028                         return err;
1029                 }
1030
1031                 RCU_INIT_POINTER(ht->next, tp_c->hlist);
1032                 rcu_assign_pointer(tp_c->hlist, ht);
1033                 *arg = ht;
1034
1035                 return 0;
1036         }
1037
1038         if (tb[TCA_U32_HASH]) {
1039                 htid = nla_get_u32(tb[TCA_U32_HASH]);
1040                 if (TC_U32_HTID(htid) == TC_U32_ROOT) {
1041                         ht = rtnl_dereference(tp->root);
1042                         htid = ht->handle;
1043                 } else {
1044                         ht = u32_lookup_ht(tp->data, TC_U32_HTID(htid));
1045                         if (!ht) {
1046                                 NL_SET_ERR_MSG_MOD(extack, "Specified hash table not found");
1047                                 return -EINVAL;
1048                         }
1049                 }
1050         } else {
1051                 ht = rtnl_dereference(tp->root);
1052                 htid = ht->handle;
1053         }
1054
1055         if (ht->divisor < TC_U32_HASH(htid)) {
1056                 NL_SET_ERR_MSG_MOD(extack, "Specified hash table buckets exceed configured value");
1057                 return -EINVAL;
1058         }
1059
1060         if (handle) {
1061                 if (TC_U32_HTID(handle) && TC_U32_HTID(handle ^ htid)) {
1062                         NL_SET_ERR_MSG_MOD(extack, "Handle specified hash table address mismatch");
1063                         return -EINVAL;
1064                 }
1065                 handle = htid | TC_U32_NODE(handle);
1066                 err = idr_alloc_u32(&ht->handle_idr, NULL, &handle, handle,
1067                                     GFP_KERNEL);
1068                 if (err)
1069                         return err;
1070         } else
1071                 handle = gen_new_kid(ht, htid);
1072
1073         if (tb[TCA_U32_SEL] == NULL) {
1074                 NL_SET_ERR_MSG_MOD(extack, "Selector not specified");
1075                 err = -EINVAL;
1076                 goto erridr;
1077         }
1078
1079         s = nla_data(tb[TCA_U32_SEL]);
1080         sel_size = struct_size(s, keys, s->nkeys);
1081         if (nla_len(tb[TCA_U32_SEL]) < sel_size) {
1082                 err = -EINVAL;
1083                 goto erridr;
1084         }
1085
1086         n = kzalloc(offsetof(typeof(*n), sel) + sel_size, GFP_KERNEL);
1087         if (n == NULL) {
1088                 err = -ENOBUFS;
1089                 goto erridr;
1090         }
1091
1092 #ifdef CONFIG_CLS_U32_PERF
1093         size = sizeof(struct tc_u32_pcnt) + s->nkeys * sizeof(u64);
1094         n->pf = __alloc_percpu(size, __alignof__(struct tc_u32_pcnt));
1095         if (!n->pf) {
1096                 err = -ENOBUFS;
1097                 goto errfree;
1098         }
1099 #endif
1100
1101         memcpy(&n->sel, s, sel_size);
1102         RCU_INIT_POINTER(n->ht_up, ht);
1103         n->handle = handle;
1104         n->fshift = s->hmask ? ffs(ntohl(s->hmask)) - 1 : 0;
1105         n->flags = flags;
1106         n->tp = tp;
1107
1108         err = tcf_exts_init(&n->exts, TCA_U32_ACT, TCA_U32_POLICE);
1109         if (err < 0)
1110                 goto errout;
1111
1112 #ifdef CONFIG_CLS_U32_MARK
1113         n->pcpu_success = alloc_percpu(u32);
1114         if (!n->pcpu_success) {
1115                 err = -ENOMEM;
1116                 goto errout;
1117         }
1118
1119         if (tb[TCA_U32_MARK]) {
1120                 struct tc_u32_mark *mark;
1121
1122                 mark = nla_data(tb[TCA_U32_MARK]);
1123                 n->val = mark->val;
1124                 n->mask = mark->mask;
1125         }
1126 #endif
1127
1128         err = u32_set_parms(net, tp, base, ht, n, tb, tca[TCA_RATE], ovr,
1129                             extack);
1130         if (err == 0) {
1131                 struct tc_u_knode __rcu **ins;
1132                 struct tc_u_knode *pins;
1133
1134                 err = u32_replace_hw_knode(tp, n, flags, extack);
1135                 if (err)
1136                         goto errhw;
1137
1138                 if (!tc_in_hw(n->flags))
1139                         n->flags |= TCA_CLS_FLAGS_NOT_IN_HW;
1140
1141                 ins = &ht->ht[TC_U32_HASH(handle)];
1142                 for (pins = rtnl_dereference(*ins); pins;
1143                      ins = &pins->next, pins = rtnl_dereference(*ins))
1144                         if (TC_U32_NODE(handle) < TC_U32_NODE(pins->handle))
1145                                 break;
1146
1147                 RCU_INIT_POINTER(n->next, pins);
1148                 rcu_assign_pointer(*ins, n);
1149                 *arg = n;
1150                 return 0;
1151         }
1152
1153 errhw:
1154 #ifdef CONFIG_CLS_U32_MARK
1155         free_percpu(n->pcpu_success);
1156 #endif
1157
1158 errout:
1159         tcf_exts_destroy(&n->exts);
1160 #ifdef CONFIG_CLS_U32_PERF
1161 errfree:
1162         free_percpu(n->pf);
1163 #endif
1164         kfree(n);
1165 erridr:
1166         idr_remove(&ht->handle_idr, handle);
1167         return err;
1168 }
1169
1170 static void u32_walk(struct tcf_proto *tp, struct tcf_walker *arg)
1171 {
1172         struct tc_u_common *tp_c = tp->data;
1173         struct tc_u_hnode *ht;
1174         struct tc_u_knode *n;
1175         unsigned int h;
1176
1177         if (arg->stop)
1178                 return;
1179
1180         for (ht = rtnl_dereference(tp_c->hlist);
1181              ht;
1182              ht = rtnl_dereference(ht->next)) {
1183                 if (ht->prio != tp->prio)
1184                         continue;
1185                 if (arg->count >= arg->skip) {
1186                         if (arg->fn(tp, ht, arg) < 0) {
1187                                 arg->stop = 1;
1188                                 return;
1189                         }
1190                 }
1191                 arg->count++;
1192                 for (h = 0; h <= ht->divisor; h++) {
1193                         for (n = rtnl_dereference(ht->ht[h]);
1194                              n;
1195                              n = rtnl_dereference(n->next)) {
1196                                 if (arg->count < arg->skip) {
1197                                         arg->count++;
1198                                         continue;
1199                                 }
1200                                 if (arg->fn(tp, n, arg) < 0) {
1201                                         arg->stop = 1;
1202                                         return;
1203                                 }
1204                                 arg->count++;
1205                         }
1206                 }
1207         }
1208 }
1209
1210 static int u32_reoffload_hnode(struct tcf_proto *tp, struct tc_u_hnode *ht,
1211                                bool add, tc_setup_cb_t *cb, void *cb_priv,
1212                                struct netlink_ext_ack *extack)
1213 {
1214         struct tc_cls_u32_offload cls_u32 = {};
1215         int err;
1216
1217         tc_cls_common_offload_init(&cls_u32.common, tp, ht->flags, extack);
1218         cls_u32.command = add ? TC_CLSU32_NEW_HNODE : TC_CLSU32_DELETE_HNODE;
1219         cls_u32.hnode.divisor = ht->divisor;
1220         cls_u32.hnode.handle = ht->handle;
1221         cls_u32.hnode.prio = ht->prio;
1222
1223         err = cb(TC_SETUP_CLSU32, &cls_u32, cb_priv);
1224         if (err && add && tc_skip_sw(ht->flags))
1225                 return err;
1226
1227         return 0;
1228 }
1229
1230 static int u32_reoffload_knode(struct tcf_proto *tp, struct tc_u_knode *n,
1231                                bool add, tc_setup_cb_t *cb, void *cb_priv,
1232                                struct netlink_ext_ack *extack)
1233 {
1234         struct tc_u_hnode *ht = rtnl_dereference(n->ht_down);
1235         struct tcf_block *block = tp->chain->block;
1236         struct tc_cls_u32_offload cls_u32 = {};
1237         int err;
1238
1239         tc_cls_common_offload_init(&cls_u32.common, tp, n->flags, extack);
1240         cls_u32.command = add ?
1241                 TC_CLSU32_REPLACE_KNODE : TC_CLSU32_DELETE_KNODE;
1242         cls_u32.knode.handle = n->handle;
1243
1244         if (add) {
1245                 cls_u32.knode.fshift = n->fshift;
1246 #ifdef CONFIG_CLS_U32_MARK
1247                 cls_u32.knode.val = n->val;
1248                 cls_u32.knode.mask = n->mask;
1249 #else
1250                 cls_u32.knode.val = 0;
1251                 cls_u32.knode.mask = 0;
1252 #endif
1253                 cls_u32.knode.sel = &n->sel;
1254                 cls_u32.knode.exts = &n->exts;
1255                 if (n->ht_down)
1256                         cls_u32.knode.link_handle = ht->handle;
1257         }
1258
1259         err = cb(TC_SETUP_CLSU32, &cls_u32, cb_priv);
1260         if (err) {
1261                 if (add && tc_skip_sw(n->flags))
1262                         return err;
1263                 return 0;
1264         }
1265
1266         tc_cls_offload_cnt_update(block, &n->in_hw_count, &n->flags, add);
1267
1268         return 0;
1269 }
1270
1271 static int u32_reoffload(struct tcf_proto *tp, bool add, tc_setup_cb_t *cb,
1272                          void *cb_priv, struct netlink_ext_ack *extack)
1273 {
1274         struct tc_u_common *tp_c = tp->data;
1275         struct tc_u_hnode *ht;
1276         struct tc_u_knode *n;
1277         unsigned int h;
1278         int err;
1279
1280         for (ht = rtnl_dereference(tp_c->hlist);
1281              ht;
1282              ht = rtnl_dereference(ht->next)) {
1283                 if (ht->prio != tp->prio)
1284                         continue;
1285
1286                 /* When adding filters to a new dev, try to offload the
1287                  * hashtable first. When removing, do the filters before the
1288                  * hashtable.
1289                  */
1290                 if (add && !tc_skip_hw(ht->flags)) {
1291                         err = u32_reoffload_hnode(tp, ht, add, cb, cb_priv,
1292                                                   extack);
1293                         if (err)
1294                                 return err;
1295                 }
1296
1297                 for (h = 0; h <= ht->divisor; h++) {
1298                         for (n = rtnl_dereference(ht->ht[h]);
1299                              n;
1300                              n = rtnl_dereference(n->next)) {
1301                                 if (tc_skip_hw(n->flags))
1302                                         continue;
1303
1304                                 err = u32_reoffload_knode(tp, n, add, cb,
1305                                                           cb_priv, extack);
1306                                 if (err)
1307                                         return err;
1308                         }
1309                 }
1310
1311                 if (!add && !tc_skip_hw(ht->flags))
1312                         u32_reoffload_hnode(tp, ht, add, cb, cb_priv, extack);
1313         }
1314
1315         return 0;
1316 }
1317
1318 static void u32_bind_class(void *fh, u32 classid, unsigned long cl)
1319 {
1320         struct tc_u_knode *n = fh;
1321
1322         if (n && n->res.classid == classid)
1323                 n->res.class = cl;
1324 }
1325
1326 static int u32_dump(struct net *net, struct tcf_proto *tp, void *fh,
1327                     struct sk_buff *skb, struct tcmsg *t)
1328 {
1329         struct tc_u_knode *n = fh;
1330         struct tc_u_hnode *ht_up, *ht_down;
1331         struct nlattr *nest;
1332
1333         if (n == NULL)
1334                 return skb->len;
1335
1336         t->tcm_handle = n->handle;
1337
1338         nest = nla_nest_start(skb, TCA_OPTIONS);
1339         if (nest == NULL)
1340                 goto nla_put_failure;
1341
1342         if (TC_U32_KEY(n->handle) == 0) {
1343                 struct tc_u_hnode *ht = fh;
1344                 u32 divisor = ht->divisor + 1;
1345
1346                 if (nla_put_u32(skb, TCA_U32_DIVISOR, divisor))
1347                         goto nla_put_failure;
1348         } else {
1349 #ifdef CONFIG_CLS_U32_PERF
1350                 struct tc_u32_pcnt *gpf;
1351                 int cpu;
1352 #endif
1353
1354                 if (nla_put(skb, TCA_U32_SEL,
1355                             sizeof(n->sel) + n->sel.nkeys*sizeof(struct tc_u32_key),
1356                             &n->sel))
1357                         goto nla_put_failure;
1358
1359                 ht_up = rtnl_dereference(n->ht_up);
1360                 if (ht_up) {
1361                         u32 htid = n->handle & 0xFFFFF000;
1362                         if (nla_put_u32(skb, TCA_U32_HASH, htid))
1363                                 goto nla_put_failure;
1364                 }
1365                 if (n->res.classid &&
1366                     nla_put_u32(skb, TCA_U32_CLASSID, n->res.classid))
1367                         goto nla_put_failure;
1368
1369                 ht_down = rtnl_dereference(n->ht_down);
1370                 if (ht_down &&
1371                     nla_put_u32(skb, TCA_U32_LINK, ht_down->handle))
1372                         goto nla_put_failure;
1373
1374                 if (n->flags && nla_put_u32(skb, TCA_U32_FLAGS, n->flags))
1375                         goto nla_put_failure;
1376
1377 #ifdef CONFIG_CLS_U32_MARK
1378                 if ((n->val || n->mask)) {
1379                         struct tc_u32_mark mark = {.val = n->val,
1380                                                    .mask = n->mask,
1381                                                    .success = 0};
1382                         int cpum;
1383
1384                         for_each_possible_cpu(cpum) {
1385                                 __u32 cnt = *per_cpu_ptr(n->pcpu_success, cpum);
1386
1387                                 mark.success += cnt;
1388                         }
1389
1390                         if (nla_put(skb, TCA_U32_MARK, sizeof(mark), &mark))
1391                                 goto nla_put_failure;
1392                 }
1393 #endif
1394
1395                 if (tcf_exts_dump(skb, &n->exts) < 0)
1396                         goto nla_put_failure;
1397
1398 #ifdef CONFIG_NET_CLS_IND
1399                 if (n->ifindex) {
1400                         struct net_device *dev;
1401                         dev = __dev_get_by_index(net, n->ifindex);
1402                         if (dev && nla_put_string(skb, TCA_U32_INDEV, dev->name))
1403                                 goto nla_put_failure;
1404                 }
1405 #endif
1406 #ifdef CONFIG_CLS_U32_PERF
1407                 gpf = kzalloc(sizeof(struct tc_u32_pcnt) +
1408                               n->sel.nkeys * sizeof(u64),
1409                               GFP_KERNEL);
1410                 if (!gpf)
1411                         goto nla_put_failure;
1412
1413                 for_each_possible_cpu(cpu) {
1414                         int i;
1415                         struct tc_u32_pcnt *pf = per_cpu_ptr(n->pf, cpu);
1416
1417                         gpf->rcnt += pf->rcnt;
1418                         gpf->rhit += pf->rhit;
1419                         for (i = 0; i < n->sel.nkeys; i++)
1420                                 gpf->kcnts[i] += pf->kcnts[i];
1421                 }
1422
1423                 if (nla_put_64bit(skb, TCA_U32_PCNT,
1424                                   sizeof(struct tc_u32_pcnt) +
1425                                   n->sel.nkeys * sizeof(u64),
1426                                   gpf, TCA_U32_PAD)) {
1427                         kfree(gpf);
1428                         goto nla_put_failure;
1429                 }
1430                 kfree(gpf);
1431 #endif
1432         }
1433
1434         nla_nest_end(skb, nest);
1435
1436         if (TC_U32_KEY(n->handle))
1437                 if (tcf_exts_dump_stats(skb, &n->exts) < 0)
1438                         goto nla_put_failure;
1439         return skb->len;
1440
1441 nla_put_failure:
1442         nla_nest_cancel(skb, nest);
1443         return -1;
1444 }
1445
1446 static struct tcf_proto_ops cls_u32_ops __read_mostly = {
1447         .kind           =       "u32",
1448         .classify       =       u32_classify,
1449         .init           =       u32_init,
1450         .destroy        =       u32_destroy,
1451         .get            =       u32_get,
1452         .change         =       u32_change,
1453         .delete         =       u32_delete,
1454         .walk           =       u32_walk,
1455         .reoffload      =       u32_reoffload,
1456         .dump           =       u32_dump,
1457         .bind_class     =       u32_bind_class,
1458         .owner          =       THIS_MODULE,
1459 };
1460
1461 static int __init init_u32(void)
1462 {
1463         int i, ret;
1464
1465         pr_info("u32 classifier\n");
1466 #ifdef CONFIG_CLS_U32_PERF
1467         pr_info("    Performance counters on\n");
1468 #endif
1469 #ifdef CONFIG_NET_CLS_IND
1470         pr_info("    input device check on\n");
1471 #endif
1472 #ifdef CONFIG_NET_CLS_ACT
1473         pr_info("    Actions configured\n");
1474 #endif
1475         tc_u_common_hash = kvmalloc_array(U32_HASH_SIZE,
1476                                           sizeof(struct hlist_head),
1477                                           GFP_KERNEL);
1478         if (!tc_u_common_hash)
1479                 return -ENOMEM;
1480
1481         for (i = 0; i < U32_HASH_SIZE; i++)
1482                 INIT_HLIST_HEAD(&tc_u_common_hash[i]);
1483
1484         ret = register_tcf_proto_ops(&cls_u32_ops);
1485         if (ret)
1486                 kvfree(tc_u_common_hash);
1487         return ret;
1488 }
1489
1490 static void __exit exit_u32(void)
1491 {
1492         unregister_tcf_proto_ops(&cls_u32_ops);
1493         kvfree(tc_u_common_hash);
1494 }
1495
1496 module_init(init_u32)
1497 module_exit(exit_u32)
1498 MODULE_LICENSE("GPL");