net/sched/cls_u32.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * net/sched/cls_u32.c  Ugly (or Universal) 32bit key Packet Classifier.
   4  *
   5  * Authors:     Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
   6  *
   7  *      The filters are packed to hash tables of key nodes
   8  *      with a set of 32bit key/mask pairs at every node.
   9  *      Nodes reference next level hash tables etc.
  10  *
  11  *      This scheme is the best universal classifier I managed to
  12  *      invent; it is not super-fast, but it is not slow (provided you
  13  *      program it correctly), and general enough.  And its relative
  14  *      speed grows as the number of rules becomes larger.
  15  *
  16  *      It seems that it represents the best middle point between
  17  *      speed and manageability both by human and by machine.
  18  *
  19  *      It is especially useful for link sharing combined with QoS;
  20  *      pure RSVP doesn't need such a general approach and can use
  21  *      much simpler (and faster) schemes, sort of cls_rsvp.c.
  22  *
  23  *      JHS: We should remove the CONFIG_NET_CLS_IND from here
  24  *      eventually when the meta match extension is made available
  25  *
  26  *      nfmark match added by Catalin(ux aka Dino) BOIE <catab at umbrella.ro>
  27  */
  28
  29 #include <linux/module.h>
  30 #include <linux/slab.h>
  31 #include <linux/types.h>
  32 #include <linux/kernel.h>
  33 #include <linux/string.h>
  34 #include <linux/errno.h>
  35 #include <linux/percpu.h>
  36 #include <linux/rtnetlink.h>
  37 #include <linux/skbuff.h>
  38 #include <linux/bitmap.h>
  39 #include <linux/netdevice.h>
  40 #include <linux/hash.h>
  41 #include <net/netlink.h>
  42 #include <net/act_api.h>
  43 #include <net/pkt_cls.h>
  44 #include <linux/idr.h>
  45
  46 struct tc_u_knode {
  47         struct tc_u_knode __rcu *next;
  48         u32                     handle;
  49         struct tc_u_hnode __rcu *ht_up;
  50         struct tcf_exts         exts;
  51 #ifdef CONFIG_NET_CLS_IND
  52         int                     ifindex;
  53 #endif
  54         u8                      fshift;
  55         struct tcf_result       res;
  56         struct tc_u_hnode __rcu *ht_down;
  57 #ifdef CONFIG_CLS_U32_PERF
  58         struct tc_u32_pcnt __percpu *pf;
  59 #endif
  60         u32                     flags;
  61         unsigned int            in_hw_count;
  62 #ifdef CONFIG_CLS_U32_MARK
  63         u32                     val;
  64         u32                     mask;
  65         u32 __percpu            *pcpu_success;
  66 #endif
  67         struct rcu_work         rwork;
  68         /* The 'sel' field MUST be the last field in structure to allow for
  69          * tc_u32_keys allocated at end of structure.
  70          */
  71         struct tc_u32_sel       sel;
  72 };
  73
  74 struct tc_u_hnode {
  75         struct tc_u_hnode __rcu *next;
  76         u32                     handle;
  77         u32                     prio;
  78         int                     refcnt;
  79         unsigned int            divisor;
  80         struct idr              handle_idr;
  81         bool                    is_root;
  82         struct rcu_head         rcu;
  83         u32                     flags;
  84         /* The 'ht' field MUST be the last field in structure to allow for
  85          * more entries allocated at end of structure.
  86          */
  87         struct tc_u_knode __rcu *ht[1];
  88 };
  89
  90 struct tc_u_common {
  91         struct tc_u_hnode __rcu *hlist;
  92         void                    *ptr;
  93         int                     refcnt;
  94         struct idr              handle_idr;
  95         struct hlist_node       hnode;
  96         long                    knodes;
  97 };
  98
  99 static inline unsigned int u32_hash_fold(__be32 key,
 100                                          const struct tc_u32_sel *sel,
 101                                          u8 fshift)
 102 {
 103         unsigned int h = ntohl(key & sel->hmask) >> fshift;
 104
 105         return h;
 106 }
 107
 108 static int u32_classify(struct sk_buff *skb, const struct tcf_proto *tp,
 109                         struct tcf_result *res)
 110 {
 111         struct {
 112                 struct tc_u_knode *knode;
 113                 unsigned int      off;
 114         } stack[TC_U32_MAXDEPTH];
 115
 116         struct tc_u_hnode *ht = rcu_dereference_bh(tp->root);
 117         unsigned int off = skb_network_offset(skb);
 118         struct tc_u_knode *n;
 119         int sdepth = 0;
 120         int off2 = 0;
 121         int sel = 0;
 122 #ifdef CONFIG_CLS_U32_PERF
 123         int j;
 124 #endif
 125         int i, r;
 126
 127 next_ht:
 128         n = rcu_dereference_bh(ht->ht[sel]);
 129
 130 next_knode:
 131         if (n) {
 132                 struct tc_u32_key *key = n->sel.keys;
 133
 134 #ifdef CONFIG_CLS_U32_PERF
 135                 __this_cpu_inc(n->pf->rcnt);
 136                 j = 0;
 137 #endif
 138
 139                 if (tc_skip_sw(n->flags)) {
 140                         n = rcu_dereference_bh(n->next);
 141                         goto next_knode;
 142                 }
 143
 144 #ifdef CONFIG_CLS_U32_MARK
 145                 if ((skb->mark & n->mask) != n->val) {
 146                         n = rcu_dereference_bh(n->next);
 147                         goto next_knode;
 148                 } else {
 149                         __this_cpu_inc(*n->pcpu_success);
 150                 }
 151 #endif
 152
 153                 for (i = n->sel.nkeys; i > 0; i--, key++) {
 154                         int toff = off + key->off + (off2 & key->offmask);
 155                         __be32 *data, hdata;
 156
 157                         if (skb_headroom(skb) + toff > INT_MAX)
 158                                 goto out;
 159
 160                         data = skb_header_pointer(skb, toff, 4, &hdata);
 161                         if (!data)
 162                                 goto out;
 163                         if ((*data ^ key->val) & key->mask) {
 164                                 n = rcu_dereference_bh(n->next);
 165                                 goto next_knode;
 166                         }
 167 #ifdef CONFIG_CLS_U32_PERF
 168                         __this_cpu_inc(n->pf->kcnts[j]);
 169                         j++;
 170 #endif
 171                 }
 172
 173                 ht = rcu_dereference_bh(n->ht_down);
 174                 if (!ht) {
 175 check_terminal:
 176                         if (n->sel.flags & TC_U32_TERMINAL) {
 177
 178                                 *res = n->res;
 179 #ifdef CONFIG_NET_CLS_IND
 180                                 if (!tcf_match_indev(skb, n->ifindex)) {
 181                                         n = rcu_dereference_bh(n->next);
 182                                         goto next_knode;
 183                                 }
 184 #endif
 185 #ifdef CONFIG_CLS_U32_PERF
 186                                 __this_cpu_inc(n->pf->rhit);
 187 #endif
 188                                 r = tcf_exts_exec(skb, &n->exts, res);
 189                                 if (r < 0) {
 190                                         n = rcu_dereference_bh(n->next);
 191                                         goto next_knode;
 192                                 }
 193
 194                                 return r;
 195                         }
 196                         n = rcu_dereference_bh(n->next);
 197                         goto next_knode;
 198                 }
 199
 200                 /* PUSH */
 201                 if (sdepth >= TC_U32_MAXDEPTH)
 202                         goto deadloop;
 203                 stack[sdepth].knode = n;
 204                 stack[sdepth].off = off;
 205                 sdepth++;
 206
 207                 ht = rcu_dereference_bh(n->ht_down);
 208                 sel = 0;
 209                 if (ht->divisor) {
 210                         __be32 *data, hdata;
 211
 212                         data = skb_header_pointer(skb, off + n->sel.hoff, 4,
 213                                                   &hdata);
 214                         if (!data)
 215                                 goto out;
 216                         sel = ht->divisor & u32_hash_fold(*data, &n->sel,
 217                                                           n->fshift);
 218                 }
 219                 if (!(n->sel.flags & (TC_U32_VAROFFSET | TC_U32_OFFSET | TC_U32_EAT)))
 220                         goto next_ht;
 221
 222                 if (n->sel.flags & (TC_U32_OFFSET | TC_U32_VAROFFSET)) {
 223                         off2 = n->sel.off + 3;
 224                         if (n->sel.flags & TC_U32_VAROFFSET) {
 225                                 __be16 *data, hdata;
 226
 227                                 data = skb_header_pointer(skb,
 228                                                           off + n->sel.offoff,
 229                                                           2, &hdata);
 230                                 if (!data)
 231                                         goto out;
 232                                 off2 += ntohs(n->sel.offmask & *data) >>
 233                                         n->sel.offshift;
 234                         }
 235                         off2 &= ~3;
 236                 }
 237                 if (n->sel.flags & TC_U32_EAT) {
 238                         off += off2;
 239                         off2 = 0;
 240                 }
 241
 242                 if (off < skb->len)
 243                         goto next_ht;
 244         }
 245
 246         /* POP */
 247         if (sdepth--) {
 248                 n = stack[sdepth].knode;
 249                 ht = rcu_dereference_bh(n->ht_up);
 250                 off = stack[sdepth].off;
 251                 goto check_terminal;
 252         }
 253 out:
 254         return -1;
 255
 256 deadloop:
 257         net_warn_ratelimited("cls_u32: dead loop\n");
 258         return -1;
 259 }
 260
 261 static struct tc_u_hnode *u32_lookup_ht(struct tc_u_common *tp_c, u32 handle)
 262 {
 263         struct tc_u_hnode *ht;
 264
 265         for (ht = rtnl_dereference(tp_c->hlist);
 266              ht;
 267              ht = rtnl_dereference(ht->next))
 268                 if (ht->handle == handle)
 269                         break;
 270
 271         return ht;
 272 }
 273
 274 static struct tc_u_knode *u32_lookup_key(struct tc_u_hnode *ht, u32 handle)
 275 {
 276         unsigned int sel;
 277         struct tc_u_knode *n = NULL;
 278
 279         sel = TC_U32_HASH(handle);
 280         if (sel > ht->divisor)
 281                 goto out;
 282
 283         for (n = rtnl_dereference(ht->ht[sel]);
 284              n;
 285              n = rtnl_dereference(n->next))
 286                 if (n->handle == handle)
 287                         break;
 288 out:
 289         return n;
 290 }
 291
 292
 293 static void *u32_get(struct tcf_proto *tp, u32 handle)
 294 {
 295         struct tc_u_hnode *ht;
 296         struct tc_u_common *tp_c = tp->data;
 297
 298         if (TC_U32_HTID(handle) == TC_U32_ROOT)
 299                 ht = rtnl_dereference(tp->root);
 300         else
 301                 ht = u32_lookup_ht(tp_c, TC_U32_HTID(handle));
 302
 303         if (!ht)
 304                 return NULL;
 305
 306         if (TC_U32_KEY(handle) == 0)
 307                 return ht;
 308
 309         return u32_lookup_key(ht, handle);
 310 }
 311
 312 /* Protected by rtnl lock */
 313 static u32 gen_new_htid(struct tc_u_common *tp_c, struct tc_u_hnode *ptr)
 314 {
 315         int id = idr_alloc_cyclic(&tp_c->handle_idr, ptr, 1, 0x7FF, GFP_KERNEL);
 316         if (id < 0)
 317                 return 0;
 318         return (id | 0x800U) << 20;
 319 }
 320
 321 static struct hlist_head *tc_u_common_hash;
 322
 323 #define U32_HASH_SHIFT 10
 324 #define U32_HASH_SIZE (1 << U32_HASH_SHIFT)
 325
 326 static void *tc_u_common_ptr(const struct tcf_proto *tp)
 327 {
 328         struct tcf_block *block = tp->chain->block;
 329
 330         /* The block sharing is currently supported only
 331          * for classless qdiscs. In that case we use block
 332          * for tc_u_common identification. In case the
 333          * block is not shared, block->q is a valid pointer
 334          * and we can use that. That works for classful qdiscs.
 335          */
 336         if (tcf_block_shared(block))
 337                 return block;
 338         else
 339                 return block->q;
 340 }
 341
 342 static struct hlist_head *tc_u_hash(void *key)
 343 {
 344         return tc_u_common_hash + hash_ptr(key, U32_HASH_SHIFT);
 345 }
 346
 347 static struct tc_u_common *tc_u_common_find(void *key)
 348 {
 349         struct tc_u_common *tc;
 350         hlist_for_each_entry(tc, tc_u_hash(key), hnode) {
 351                 if (tc->ptr == key)
 352                         return tc;
 353         }
 354         return NULL;
 355 }
 356
 357 static int u32_init(struct tcf_proto *tp)
 358 {
 359         struct tc_u_hnode *root_ht;
 360         void *key = tc_u_common_ptr(tp);
 361         struct tc_u_common *tp_c = tc_u_common_find(key);
 362
 363         root_ht = kzalloc(sizeof(*root_ht), GFP_KERNEL);
 364         if (root_ht == NULL)
 365                 return -ENOBUFS;
 366
 367         root_ht->refcnt++;
 368         root_ht->handle = tp_c ? gen_new_htid(tp_c, root_ht) : 0x80000000;
 369         root_ht->prio = tp->prio;
 370         root_ht->is_root = true;
 371         idr_init(&root_ht->handle_idr);
 372
 373         if (tp_c == NULL) {
 374                 tp_c = kzalloc(sizeof(*tp_c), GFP_KERNEL);
 375                 if (tp_c == NULL) {
 376                         kfree(root_ht);
 377                         return -ENOBUFS;
 378                 }
 379                 tp_c->ptr = key;
 380                 INIT_HLIST_NODE(&tp_c->hnode);
 381                 idr_init(&tp_c->handle_idr);
 382
 383                 hlist_add_head(&tp_c->hnode, tc_u_hash(key));
 384         }
 385
 386         tp_c->refcnt++;
 387         RCU_INIT_POINTER(root_ht->next, tp_c->hlist);
 388         rcu_assign_pointer(tp_c->hlist, root_ht);
 389
 390         root_ht->refcnt++;
 391         rcu_assign_pointer(tp->root, root_ht);
 392         tp->data = tp_c;
 393         return 0;
 394 }
 395
 396 static int u32_destroy_key(struct tc_u_knode *n, bool free_pf)
 397 {
 398         struct tc_u_hnode *ht = rtnl_dereference(n->ht_down);
 399
 400         tcf_exts_destroy(&n->exts);
 401         tcf_exts_put_net(&n->exts);
 402         if (ht && --ht->refcnt == 0)
 403                 kfree(ht);
 404 #ifdef CONFIG_CLS_U32_PERF
 405         if (free_pf)
 406                 free_percpu(n->pf);
 407 #endif
 408 #ifdef CONFIG_CLS_U32_MARK
 409         if (free_pf)
 410                 free_percpu(n->pcpu_success);
 411 #endif
 412         kfree(n);
 413         return 0;
 414 }
 415
 416 /* u32_delete_key_rcu should be called when free'ing a copied
 417  * version of a tc_u_knode obtained from u32_init_knode(). When
 418  * copies are obtained from u32_init_knode() the statistics are
 419  * shared between the old and new copies to allow readers to
 420  * continue to update the statistics during the copy. To support
 421  * this the u32_delete_key_rcu variant does not free the percpu
 422  * statistics.
 423  */
 424 static void u32_delete_key_work(struct work_struct *work)
 425 {
 426         struct tc_u_knode *key = container_of(to_rcu_work(work),
 427                                               struct tc_u_knode,
 428                                               rwork);
 429         rtnl_lock();
 430         u32_destroy_key(key, false);
 431         rtnl_unlock();
 432 }
 433
 434 /* u32_delete_key_freepf_rcu is the rcu callback variant
 435  * that free's the entire structure including the statistics
 436  * percpu variables. Only use this if the key is not a copy
 437  * returned by u32_init_knode(). See u32_delete_key_rcu()
 438  * for the variant that should be used with keys return from
 439  * u32_init_knode()
 440  */
 441 static void u32_delete_key_freepf_work(struct work_struct *work)
 442 {
 443         struct tc_u_knode *key = container_of(to_rcu_work(work),
 444                                               struct tc_u_knode,
 445                                               rwork);
 446         rtnl_lock();
 447         u32_destroy_key(key, true);
 448         rtnl_unlock();
 449 }
 450
 451 static int u32_delete_key(struct tcf_proto *tp, struct tc_u_knode *key)
 452 {
 453         struct tc_u_common *tp_c = tp->data;
 454         struct tc_u_knode __rcu **kp;
 455         struct tc_u_knode *pkp;
 456         struct tc_u_hnode *ht = rtnl_dereference(key->ht_up);
 457
 458         if (ht) {
 459                 kp = &ht->ht[TC_U32_HASH(key->handle)];
 460                 for (pkp = rtnl_dereference(*kp); pkp;
 461                      kp = &pkp->next, pkp = rtnl_dereference(*kp)) {
 462                         if (pkp == key) {
 463                                 RCU_INIT_POINTER(*kp, key->next);
 464                                 tp_c->knodes--;
 465
 466                                 tcf_unbind_filter(tp, &key->res);
 467                                 idr_remove(&ht->handle_idr, key->handle);
 468                                 tcf_exts_get_net(&key->exts);
 469                                 tcf_queue_work(&key->rwork, u32_delete_key_freepf_work);
 470                                 return 0;
 471                         }
 472                 }
 473         }
 474         WARN_ON(1);
 475         return 0;
 476 }
 477
 478 static void u32_clear_hw_hnode(struct tcf_proto *tp, struct tc_u_hnode *h,
 479                                struct netlink_ext_ack *extack)
 480 {
 481         struct tcf_block *block = tp->chain->block;
 482         struct tc_cls_u32_offload cls_u32 = {};
 483
 484         tc_cls_common_offload_init(&cls_u32.common, tp, h->flags, extack);
 485         cls_u32.command = TC_CLSU32_DELETE_HNODE;
 486         cls_u32.hnode.divisor = h->divisor;
 487         cls_u32.hnode.handle = h->handle;
 488         cls_u32.hnode.prio = h->prio;
 489
 490         tc_setup_cb_call(block, TC_SETUP_CLSU32, &cls_u32, false);
 491 }
 492
 493 static int u32_replace_hw_hnode(struct tcf_proto *tp, struct tc_u_hnode *h,
 494                                 u32 flags, struct netlink_ext_ack *extack)
 495 {
 496         struct tcf_block *block = tp->chain->block;
 497         struct tc_cls_u32_offload cls_u32 = {};
 498         bool skip_sw = tc_skip_sw(flags);
 499         bool offloaded = false;
 500         int err;
 501
 502         tc_cls_common_offload_init(&cls_u32.common, tp, flags, extack);
 503         cls_u32.command = TC_CLSU32_NEW_HNODE;
 504         cls_u32.hnode.divisor = h->divisor;
 505         cls_u32.hnode.handle = h->handle;
 506         cls_u32.hnode.prio = h->prio;
 507
 508         err = tc_setup_cb_call(block, TC_SETUP_CLSU32, &cls_u32, skip_sw);
 509         if (err < 0) {
 510                 u32_clear_hw_hnode(tp, h, NULL);
 511                 return err;
 512         } else if (err > 0) {
 513                 offloaded = true;
 514         }
 515
 516         if (skip_sw && !offloaded)
 517                 return -EINVAL;
 518
 519         return 0;
 520 }
 521
 522 static void u32_remove_hw_knode(struct tcf_proto *tp, struct tc_u_knode *n,
 523                                 struct netlink_ext_ack *extack)
 524 {
 525         struct tcf_block *block = tp->chain->block;
 526         struct tc_cls_u32_offload cls_u32 = {};
 527
 528         tc_cls_common_offload_init(&cls_u32.common, tp, n->flags, extack);
 529         cls_u32.command = TC_CLSU32_DELETE_KNODE;
 530         cls_u32.knode.handle = n->handle;
 531
 532         tc_setup_cb_call(block, TC_SETUP_CLSU32, &cls_u32, false);
 533         tcf_block_offload_dec(block, &n->flags);
 534 }
 535
 536 static int u32_replace_hw_knode(struct tcf_proto *tp, struct tc_u_knode *n,
 537                                 u32 flags, struct netlink_ext_ack *extack)
 538 {
 539         struct tc_u_hnode *ht = rtnl_dereference(n->ht_down);
 540         struct tcf_block *block = tp->chain->block;
 541         struct tc_cls_u32_offload cls_u32 = {};
 542         bool skip_sw = tc_skip_sw(flags);
 543         int err;
 544
 545         tc_cls_common_offload_init(&cls_u32.common, tp, flags, extack);
 546         cls_u32.command = TC_CLSU32_REPLACE_KNODE;
 547         cls_u32.knode.handle = n->handle;
 548         cls_u32.knode.fshift = n->fshift;
 549 #ifdef CONFIG_CLS_U32_MARK
 550         cls_u32.knode.val = n->val;
 551         cls_u32.knode.mask = n->mask;
 552 #else
 553         cls_u32.knode.val = 0;
 554         cls_u32.knode.mask = 0;
 555 #endif
 556         cls_u32.knode.sel = &n->sel;
 557         cls_u32.knode.res = &n->res;
 558         cls_u32.knode.exts = &n->exts;
 559         if (n->ht_down)
 560                 cls_u32.knode.link_handle = ht->handle;
 561
 562         err = tc_setup_cb_call(block, TC_SETUP_CLSU32, &cls_u32, skip_sw);
 563         if (err < 0) {
 564                 u32_remove_hw_knode(tp, n, NULL);
 565                 return err;
 566         } else if (err > 0) {
 567                 n->in_hw_count = err;
 568                 tcf_block_offload_inc(block, &n->flags);
 569         }
 570
 571         if (skip_sw && !(n->flags & TCA_CLS_FLAGS_IN_HW))
 572                 return -EINVAL;
 573
 574         return 0;
 575 }
 576
 577 static void u32_clear_hnode(struct tcf_proto *tp, struct tc_u_hnode *ht,
 578                             struct netlink_ext_ack *extack)
 579 {
 580         struct tc_u_common *tp_c = tp->data;
 581         struct tc_u_knode *n;
 582         unsigned int h;
 583
 584         for (h = 0; h <= ht->divisor; h++) {
 585                 while ((n = rtnl_dereference(ht->ht[h])) != NULL) {
 586                         RCU_INIT_POINTER(ht->ht[h],
 587                                          rtnl_dereference(n->next));
 588                         tp_c->knodes--;
 589                         tcf_unbind_filter(tp, &n->res);
 590                         u32_remove_hw_knode(tp, n, extack);
 591                         idr_remove(&ht->handle_idr, n->handle);
 592                         if (tcf_exts_get_net(&n->exts))
 593                                 tcf_queue_work(&n->rwork, u32_delete_key_freepf_work);
 594                         else
 595                                 u32_destroy_key(n, true);
 596                 }
 597         }
 598 }
 599
 600 static int u32_destroy_hnode(struct tcf_proto *tp, struct tc_u_hnode *ht,
 601                              struct netlink_ext_ack *extack)
 602 {
 603         struct tc_u_common *tp_c = tp->data;
 604         struct tc_u_hnode __rcu **hn;
 605         struct tc_u_hnode *phn;
 606
 607         WARN_ON(--ht->refcnt);
 608
 609         u32_clear_hnode(tp, ht, extack);
 610
 611         hn = &tp_c->hlist;
 612         for (phn = rtnl_dereference(*hn);
 613              phn;
 614              hn = &phn->next, phn = rtnl_dereference(*hn)) {
 615                 if (phn == ht) {
 616                         u32_clear_hw_hnode(tp, ht, extack);
 617                         idr_destroy(&ht->handle_idr);
 618                         idr_remove(&tp_c->handle_idr, ht->handle);
 619                         RCU_INIT_POINTER(*hn, ht->next);
 620                         kfree_rcu(ht, rcu);
 621                         return 0;
 622                 }
 623         }
 624
 625         return -ENOENT;
 626 }
 627
 628 static void u32_destroy(struct tcf_proto *tp, bool rtnl_held,
 629                         struct netlink_ext_ack *extack)
 630 {
 631         struct tc_u_common *tp_c = tp->data;
 632         struct tc_u_hnode *root_ht = rtnl_dereference(tp->root);
 633
 634         WARN_ON(root_ht == NULL);
 635
 636         if (root_ht && --root_ht->refcnt == 1)
 637                 u32_destroy_hnode(tp, root_ht, extack);
 638
 639         if (--tp_c->refcnt == 0) {
 640                 struct tc_u_hnode *ht;
 641
 642                 hlist_del(&tp_c->hnode);
 643
 644                 while ((ht = rtnl_dereference(tp_c->hlist)) != NULL) {
 645                         u32_clear_hnode(tp, ht, extack);
 646                         RCU_INIT_POINTER(tp_c->hlist, ht->next);
 647
 648                         /* u32_destroy_key() will later free ht for us, if it's
 649                          * still referenced by some knode
 650                          */
 651                         if (--ht->refcnt == 0)
 652                                 kfree_rcu(ht, rcu);
 653                 }
 654
 655                 idr_destroy(&tp_c->handle_idr);
 656                 kfree(tp_c);
 657         }
 658
 659         tp->data = NULL;
 660 }
 661
 662 static int u32_delete(struct tcf_proto *tp, void *arg, bool *last,
 663                       bool rtnl_held, struct netlink_ext_ack *extack)
 664 {
 665         struct tc_u_hnode *ht = arg;
 666         struct tc_u_common *tp_c = tp->data;
 667         int ret = 0;
 668
 669         if (TC_U32_KEY(ht->handle)) {
 670                 u32_remove_hw_knode(tp, (struct tc_u_knode *)ht, extack);
 671                 ret = u32_delete_key(tp, (struct tc_u_knode *)ht);
 672                 goto out;
 673         }
 674
 675         if (ht->is_root) {
 676                 NL_SET_ERR_MSG_MOD(extack, "Not allowed to delete root node");
 677                 return -EINVAL;
 678         }
 679
 680         if (ht->refcnt == 1) {
 681                 u32_destroy_hnode(tp, ht, extack);
 682         } else {
 683                 NL_SET_ERR_MSG_MOD(extack, "Can not delete in-use filter");
 684                 return -EBUSY;
 685         }
 686
 687 out:
 688         *last = tp_c->refcnt == 1 && tp_c->knodes == 0;
 689         return ret;
 690 }
 691
 692 static u32 gen_new_kid(struct tc_u_hnode *ht, u32 htid)
 693 {
 694         u32 index = htid | 0x800;
 695         u32 max = htid | 0xFFF;
 696
 697         if (idr_alloc_u32(&ht->handle_idr, NULL, &index, max, GFP_KERNEL)) {
 698                 index = htid + 1;
 699                 if (idr_alloc_u32(&ht->handle_idr, NULL, &index, max,
 700                                  GFP_KERNEL))
 701                         index = max;
 702         }
 703
 704         return index;
 705 }
 706
 707 static const struct nla_policy u32_policy[TCA_U32_MAX + 1] = {
 708         [TCA_U32_CLASSID]       = { .type = NLA_U32 },
 709         [TCA_U32_HASH]          = { .type = NLA_U32 },
 710         [TCA_U32_LINK]          = { .type = NLA_U32 },
 711         [TCA_U32_DIVISOR]       = { .type = NLA_U32 },
 712         [TCA_U32_SEL]           = { .len = sizeof(struct tc_u32_sel) },
 713         [TCA_U32_INDEV]         = { .type = NLA_STRING, .len = IFNAMSIZ },
 714         [TCA_U32_MARK]          = { .len = sizeof(struct tc_u32_mark) },
 715         [TCA_U32_FLAGS]         = { .type = NLA_U32 },
 716 };
 717
 718 static int u32_set_parms(struct net *net, struct tcf_proto *tp,
 719                          unsigned long base,
 720                          struct tc_u_knode *n, struct nlattr **tb,
 721                          struct nlattr *est, bool ovr,
 722                          struct netlink_ext_ack *extack)
 723 {
 724         int err;
 725
 726         err = tcf_exts_validate(net, tp, tb, est, &n->exts, ovr, true, extack);
 727         if (err < 0)
 728                 return err;
 729
 730         if (tb[TCA_U32_LINK]) {
 731                 u32 handle = nla_get_u32(tb[TCA_U32_LINK]);
 732                 struct tc_u_hnode *ht_down = NULL, *ht_old;
 733
 734                 if (TC_U32_KEY(handle)) {
 735                         NL_SET_ERR_MSG_MOD(extack, "u32 Link handle must be a hash table");
 736                         return -EINVAL;
 737                 }
 738
 739                 if (handle) {
 740                         ht_down = u32_lookup_ht(tp->data, handle);
 741
 742                         if (!ht_down) {
 743                                 NL_SET_ERR_MSG_MOD(extack, "Link hash table not found");
 744                                 return -EINVAL;
 745                         }
 746                         if (ht_down->is_root) {
 747                                 NL_SET_ERR_MSG_MOD(extack, "Not linking to root node");
 748                                 return -EINVAL;
 749                         }
 750                         ht_down->refcnt++;
 751                 }
 752
 753                 ht_old = rtnl_dereference(n->ht_down);
 754                 rcu_assign_pointer(n->ht_down, ht_down);
 755
 756                 if (ht_old)
 757                         ht_old->refcnt--;
 758         }
 759         if (tb[TCA_U32_CLASSID]) {
 760                 n->res.classid = nla_get_u32(tb[TCA_U32_CLASSID]);
 761                 tcf_bind_filter(tp, &n->res, base);
 762         }
 763
 764 #ifdef CONFIG_NET_CLS_IND
 765         if (tb[TCA_U32_INDEV]) {
 766                 int ret;
 767                 ret = tcf_change_indev(net, tb[TCA_U32_INDEV], extack);
 768                 if (ret < 0)
 769                         return -EINVAL;
 770                 n->ifindex = ret;
 771         }
 772 #endif
 773         return 0;
 774 }
 775
 776 static void u32_replace_knode(struct tcf_proto *tp, struct tc_u_common *tp_c,
 777                               struct tc_u_knode *n)
 778 {
 779         struct tc_u_knode __rcu **ins;
 780         struct tc_u_knode *pins;
 781         struct tc_u_hnode *ht;
 782
 783         if (TC_U32_HTID(n->handle) == TC_U32_ROOT)
 784                 ht = rtnl_dereference(tp->root);
 785         else
 786                 ht = u32_lookup_ht(tp_c, TC_U32_HTID(n->handle));
 787
 788         ins = &ht->ht[TC_U32_HASH(n->handle)];
 789
 790         /* The node must always exist for it to be replaced if this is not the
 791          * case then something went very wrong elsewhere.
 792          */
 793         for (pins = rtnl_dereference(*ins); ;
 794              ins = &pins->next, pins = rtnl_dereference(*ins))
 795                 if (pins->handle == n->handle)
 796                         break;
 797
 798         idr_replace(&ht->handle_idr, n, n->handle);
 799         RCU_INIT_POINTER(n->next, pins->next);
 800         rcu_assign_pointer(*ins, n);
 801 }
 802
 803 static struct tc_u_knode *u32_init_knode(struct net *net, struct tcf_proto *tp,
 804                                          struct tc_u_knode *n)
 805 {
 806         struct tc_u_hnode *ht = rtnl_dereference(n->ht_down);
 807         struct tc_u32_sel *s = &n->sel;
 808         struct tc_u_knode *new;
 809
 810         new = kzalloc(sizeof(*n) + s->nkeys*sizeof(struct tc_u32_key),
 811                       GFP_KERNEL);
 812
 813         if (!new)
 814                 return NULL;
 815
 816         RCU_INIT_POINTER(new->next, n->next);
 817         new->handle = n->handle;
 818         RCU_INIT_POINTER(new->ht_up, n->ht_up);
 819
 820 #ifdef CONFIG_NET_CLS_IND
 821         new->ifindex = n->ifindex;
 822 #endif
 823         new->fshift = n->fshift;
 824         new->res = n->res;
 825         new->flags = n->flags;
 826         RCU_INIT_POINTER(new->ht_down, ht);
 827
 828         /* bump reference count as long as we hold pointer to structure */
 829         if (ht)
 830                 ht->refcnt++;
 831
 832 #ifdef CONFIG_CLS_U32_PERF
 833         /* Statistics may be incremented by readers during update
 834          * so we must keep them in tact. When the node is later destroyed
 835          * a special destroy call must be made to not free the pf memory.
 836          */
 837         new->pf = n->pf;
 838 #endif
 839
 840 #ifdef CONFIG_CLS_U32_MARK
 841         new->val = n->val;
 842         new->mask = n->mask;
 843         /* Similarly success statistics must be moved as pointers */
 844         new->pcpu_success = n->pcpu_success;
 845 #endif
 846         memcpy(&new->sel, s, struct_size(s, keys, s->nkeys));
 847
 848         if (tcf_exts_init(&new->exts, net, TCA_U32_ACT, TCA_U32_POLICE)) {
 849                 kfree(new);
 850                 return NULL;
 851         }
 852
 853         return new;
 854 }
 855
 856 static int u32_change(struct net *net, struct sk_buff *in_skb,
 857                       struct tcf_proto *tp, unsigned long base, u32 handle,
 858                       struct nlattr **tca, void **arg, bool ovr, bool rtnl_held,
 859                       struct netlink_ext_ack *extack)
 860 {
 861         struct tc_u_common *tp_c = tp->data;
 862         struct tc_u_hnode *ht;
 863         struct tc_u_knode *n;
 864         struct tc_u32_sel *s;
 865         struct nlattr *opt = tca[TCA_OPTIONS];
 866         struct nlattr *tb[TCA_U32_MAX + 1];
 867         u32 htid, flags = 0;
 868         size_t sel_size;
 869         int err;
 870 #ifdef CONFIG_CLS_U32_PERF
 871         size_t size;
 872 #endif
 873
 874         if (!opt) {
 875                 if (handle) {
 876                         NL_SET_ERR_MSG_MOD(extack, "Filter handle requires options");
 877                         return -EINVAL;
 878                 } else {
 879                         return 0;
 880                 }
 881         }
 882
 883         err = nla_parse_nested_deprecated(tb, TCA_U32_MAX, opt, u32_policy,
 884                                           extack);
 885         if (err < 0)
 886                 return err;
 887
 888         if (tb[TCA_U32_FLAGS]) {
 889                 flags = nla_get_u32(tb[TCA_U32_FLAGS]);
 890                 if (!tc_flags_valid(flags)) {
 891                         NL_SET_ERR_MSG_MOD(extack, "Invalid filter flags");
 892                         return -EINVAL;
 893                 }
 894         }
 895
 896         n = *arg;
 897         if (n) {
 898                 struct tc_u_knode *new;
 899
 900                 if (TC_U32_KEY(n->handle) == 0) {
 901                         NL_SET_ERR_MSG_MOD(extack, "Key node id cannot be zero");
 902                         return -EINVAL;
 903                 }
 904
 905                 if ((n->flags ^ flags) &
 906                     ~(TCA_CLS_FLAGS_IN_HW | TCA_CLS_FLAGS_NOT_IN_HW)) {
 907                         NL_SET_ERR_MSG_MOD(extack, "Key node flags do not match passed flags");
 908                         return -EINVAL;
 909                 }
 910
 911                 new = u32_init_knode(net, tp, n);
 912                 if (!new)
 913                         return -ENOMEM;
 914
 915                 err = u32_set_parms(net, tp, base, new, tb,
 916                                     tca[TCA_RATE], ovr, extack);
 917
 918                 if (err) {
 919                         u32_destroy_key(new, false);
 920                         return err;
 921                 }
 922
 923                 err = u32_replace_hw_knode(tp, new, flags, extack);
 924                 if (err) {
 925                         u32_destroy_key(new, false);
 926                         return err;
 927                 }
 928
 929                 if (!tc_in_hw(new->flags))
 930                         new->flags |= TCA_CLS_FLAGS_NOT_IN_HW;
 931
 932                 u32_replace_knode(tp, tp_c, new);
 933                 tcf_unbind_filter(tp, &n->res);
 934                 tcf_exts_get_net(&n->exts);
 935                 tcf_queue_work(&n->rwork, u32_delete_key_work);
 936                 return 0;
 937         }
 938
 939         if (tb[TCA_U32_DIVISOR]) {
 940                 unsigned int divisor = nla_get_u32(tb[TCA_U32_DIVISOR]);
 941
 942                 if (!is_power_of_2(divisor)) {
 943                         NL_SET_ERR_MSG_MOD(extack, "Divisor is not a power of 2");
 944                         return -EINVAL;
 945                 }
 946                 if (divisor-- > 0x100) {
 947                         NL_SET_ERR_MSG_MOD(extack, "Exceeded maximum 256 hash buckets");
 948                         return -EINVAL;
 949                 }
 950                 if (TC_U32_KEY(handle)) {
 951                         NL_SET_ERR_MSG_MOD(extack, "Divisor can only be used on a hash table");
 952                         return -EINVAL;
 953                 }
 954                 ht = kzalloc(sizeof(*ht) + divisor*sizeof(void *), GFP_KERNEL);
 955                 if (ht == NULL)
 956                         return -ENOBUFS;
 957                 if (handle == 0) {
 958                         handle = gen_new_htid(tp->data, ht);
 959                         if (handle == 0) {
 960                                 kfree(ht);
 961                                 return -ENOMEM;
 962                         }
 963                 } else {
 964                         err = idr_alloc_u32(&tp_c->handle_idr, ht, &handle,
 965                                             handle, GFP_KERNEL);
 966                         if (err) {
 967                                 kfree(ht);
 968                                 return err;
 969                         }
 970                 }
 971                 ht->refcnt = 1;
 972                 ht->divisor = divisor;
 973                 ht->handle = handle;
 974                 ht->prio = tp->prio;
 975                 idr_init(&ht->handle_idr);
 976                 ht->flags = flags;
 977
 978                 err = u32_replace_hw_hnode(tp, ht, flags, extack);
 979                 if (err) {
 980                         idr_remove(&tp_c->handle_idr, handle);
 981                         kfree(ht);
 982                         return err;
 983                 }
 984
 985                 RCU_INIT_POINTER(ht->next, tp_c->hlist);
 986                 rcu_assign_pointer(tp_c->hlist, ht);
 987                 *arg = ht;
 988
 989                 return 0;
 990         }
 991
 992         if (tb[TCA_U32_HASH]) {
 993                 htid = nla_get_u32(tb[TCA_U32_HASH]);
 994                 if (TC_U32_HTID(htid) == TC_U32_ROOT) {
 995                         ht = rtnl_dereference(tp->root);
 996                         htid = ht->handle;
 997                 } else {
 998                         ht = u32_lookup_ht(tp->data, TC_U32_HTID(htid));
 999                         if (!ht) {
1000                                 NL_SET_ERR_MSG_MOD(extack, "Specified hash table not found");
1001                                 return -EINVAL;
1002                         }
1003                 }
1004         } else {
1005                 ht = rtnl_dereference(tp->root);
1006                 htid = ht->handle;
1007         }
1008
1009         if (ht->divisor < TC_U32_HASH(htid)) {
1010                 NL_SET_ERR_MSG_MOD(extack, "Specified hash table buckets exceed configured value");
1011                 return -EINVAL;
1012         }
1013
1014         if (handle) {
1015                 if (TC_U32_HTID(handle) && TC_U32_HTID(handle ^ htid)) {
1016                         NL_SET_ERR_MSG_MOD(extack, "Handle specified hash table address mismatch");
1017                         return -EINVAL;
1018                 }
1019                 handle = htid | TC_U32_NODE(handle);
1020                 err = idr_alloc_u32(&ht->handle_idr, NULL, &handle, handle,
1021                                     GFP_KERNEL);
1022                 if (err)
1023                         return err;
1024         } else
1025                 handle = gen_new_kid(ht, htid);
1026
1027         if (tb[TCA_U32_SEL] == NULL) {
1028                 NL_SET_ERR_MSG_MOD(extack, "Selector not specified");
1029                 err = -EINVAL;
1030                 goto erridr;
1031         }
1032
1033         s = nla_data(tb[TCA_U32_SEL]);
1034         sel_size = struct_size(s, keys, s->nkeys);
1035         if (nla_len(tb[TCA_U32_SEL]) < sel_size) {
1036                 err = -EINVAL;
1037                 goto erridr;
1038         }
1039
1040         n = kzalloc(offsetof(typeof(*n), sel) + sel_size, GFP_KERNEL);
1041         if (n == NULL) {
1042                 err = -ENOBUFS;
1043                 goto erridr;
1044         }
1045
1046 #ifdef CONFIG_CLS_U32_PERF
1047         size = sizeof(struct tc_u32_pcnt) + s->nkeys * sizeof(u64);
1048         n->pf = __alloc_percpu(size, __alignof__(struct tc_u32_pcnt));
1049         if (!n->pf) {
1050                 err = -ENOBUFS;
1051                 goto errfree;
1052         }
1053 #endif
1054
1055         memcpy(&n->sel, s, sel_size);
1056         RCU_INIT_POINTER(n->ht_up, ht);
1057         n->handle = handle;
1058         n->fshift = s->hmask ? ffs(ntohl(s->hmask)) - 1 : 0;
1059         n->flags = flags;
1060
1061         err = tcf_exts_init(&n->exts, net, TCA_U32_ACT, TCA_U32_POLICE);
1062         if (err < 0)
1063                 goto errout;
1064
1065 #ifdef CONFIG_CLS_U32_MARK
1066         n->pcpu_success = alloc_percpu(u32);
1067         if (!n->pcpu_success) {
1068                 err = -ENOMEM;
1069                 goto errout;
1070         }
1071
1072         if (tb[TCA_U32_MARK]) {
1073                 struct tc_u32_mark *mark;
1074
1075                 mark = nla_data(tb[TCA_U32_MARK]);
1076                 n->val = mark->val;
1077                 n->mask = mark->mask;
1078         }
1079 #endif
1080
1081         err = u32_set_parms(net, tp, base, n, tb, tca[TCA_RATE], ovr,
1082                             extack);
1083         if (err == 0) {
1084                 struct tc_u_knode __rcu **ins;
1085                 struct tc_u_knode *pins;
1086
1087                 err = u32_replace_hw_knode(tp, n, flags, extack);
1088                 if (err)
1089                         goto errhw;
1090
1091                 if (!tc_in_hw(n->flags))
1092                         n->flags |= TCA_CLS_FLAGS_NOT_IN_HW;
1093
1094                 ins = &ht->ht[TC_U32_HASH(handle)];
1095                 for (pins = rtnl_dereference(*ins); pins;
1096                      ins = &pins->next, pins = rtnl_dereference(*ins))
1097                         if (TC_U32_NODE(handle) < TC_U32_NODE(pins->handle))
1098                                 break;
1099
1100                 RCU_INIT_POINTER(n->next, pins);
1101                 rcu_assign_pointer(*ins, n);
1102                 tp_c->knodes++;
1103                 *arg = n;
1104                 return 0;
1105         }
1106
1107 errhw:
1108 #ifdef CONFIG_CLS_U32_MARK
1109         free_percpu(n->pcpu_success);
1110 #endif
1111
1112 errout:
1113         tcf_exts_destroy(&n->exts);
1114 #ifdef CONFIG_CLS_U32_PERF
1115 errfree:
1116         free_percpu(n->pf);
1117 #endif
1118         kfree(n);
1119 erridr:
1120         idr_remove(&ht->handle_idr, handle);
1121         return err;
1122 }
1123
1124 static void u32_walk(struct tcf_proto *tp, struct tcf_walker *arg,
1125                      bool rtnl_held)
1126 {
1127         struct tc_u_common *tp_c = tp->data;
1128         struct tc_u_hnode *ht;
1129         struct tc_u_knode *n;
1130         unsigned int h;
1131
1132         if (arg->stop)
1133                 return;
1134
1135         for (ht = rtnl_dereference(tp_c->hlist);
1136              ht;
1137              ht = rtnl_dereference(ht->next)) {
1138                 if (ht->prio != tp->prio)
1139                         continue;
1140                 if (arg->count >= arg->skip) {
1141                         if (arg->fn(tp, ht, arg) < 0) {
1142                                 arg->stop = 1;
1143                                 return;
1144                         }
1145                 }
1146                 arg->count++;
1147                 for (h = 0; h <= ht->divisor; h++) {
1148                         for (n = rtnl_dereference(ht->ht[h]);
1149                              n;
1150                              n = rtnl_dereference(n->next)) {
1151                                 if (arg->count < arg->skip) {
1152                                         arg->count++;
1153                                         continue;
1154                                 }
1155                                 if (arg->fn(tp, n, arg) < 0) {
1156                                         arg->stop = 1;
1157                                         return;
1158                                 }
1159                                 arg->count++;
1160                         }
1161                 }
1162         }
1163 }
1164
1165 static int u32_reoffload_hnode(struct tcf_proto *tp, struct tc_u_hnode *ht,
1166                                bool add, tc_setup_cb_t *cb, void *cb_priv,
1167                                struct netlink_ext_ack *extack)
1168 {
1169         struct tc_cls_u32_offload cls_u32 = {};
1170         int err;
1171
1172         tc_cls_common_offload_init(&cls_u32.common, tp, ht->flags, extack);
1173         cls_u32.command = add ? TC_CLSU32_NEW_HNODE : TC_CLSU32_DELETE_HNODE;
1174         cls_u32.hnode.divisor = ht->divisor;
1175         cls_u32.hnode.handle = ht->handle;
1176         cls_u32.hnode.prio = ht->prio;
1177
1178         err = cb(TC_SETUP_CLSU32, &cls_u32, cb_priv);
1179         if (err && add && tc_skip_sw(ht->flags))
1180                 return err;
1181
1182         return 0;
1183 }
1184
1185 static int u32_reoffload_knode(struct tcf_proto *tp, struct tc_u_knode *n,
1186                                bool add, tc_setup_cb_t *cb, void *cb_priv,
1187                                struct netlink_ext_ack *extack)
1188 {
1189         struct tc_u_hnode *ht = rtnl_dereference(n->ht_down);
1190         struct tcf_block *block = tp->chain->block;
1191         struct tc_cls_u32_offload cls_u32 = {};
1192         int err;
1193
1194         tc_cls_common_offload_init(&cls_u32.common, tp, n->flags, extack);
1195         cls_u32.command = add ?
1196                 TC_CLSU32_REPLACE_KNODE : TC_CLSU32_DELETE_KNODE;
1197         cls_u32.knode.handle = n->handle;
1198
1199         if (add) {
1200                 cls_u32.knode.fshift = n->fshift;
1201 #ifdef CONFIG_CLS_U32_MARK
1202                 cls_u32.knode.val = n->val;
1203                 cls_u32.knode.mask = n->mask;
1204 #else
1205                 cls_u32.knode.val = 0;
1206                 cls_u32.knode.mask = 0;
1207 #endif
1208                 cls_u32.knode.sel = &n->sel;
1209                 cls_u32.knode.res = &n->res;
1210                 cls_u32.knode.exts = &n->exts;
1211                 if (n->ht_down)
1212                         cls_u32.knode.link_handle = ht->handle;
1213         }
1214
1215         err = cb(TC_SETUP_CLSU32, &cls_u32, cb_priv);
1216         if (err) {
1217                 if (add && tc_skip_sw(n->flags))
1218                         return err;
1219                 return 0;
1220         }
1221
1222         tc_cls_offload_cnt_update(block, &n->in_hw_count, &n->flags, add);
1223
1224         return 0;
1225 }
1226
1227 static int u32_reoffload(struct tcf_proto *tp, bool add, tc_setup_cb_t *cb,
1228                          void *cb_priv, struct netlink_ext_ack *extack)
1229 {
1230         struct tc_u_common *tp_c = tp->data;
1231         struct tc_u_hnode *ht;
1232         struct tc_u_knode *n;
1233         unsigned int h;
1234         int err;
1235
1236         for (ht = rtnl_dereference(tp_c->hlist);
1237              ht;
1238              ht = rtnl_dereference(ht->next)) {
1239                 if (ht->prio != tp->prio)
1240                         continue;
1241
1242                 /* When adding filters to a new dev, try to offload the
1243                  * hashtable first. When removing, do the filters before the
1244                  * hashtable.
1245                  */
1246                 if (add && !tc_skip_hw(ht->flags)) {
1247                         err = u32_reoffload_hnode(tp, ht, add, cb, cb_priv,
1248                                                   extack);
1249                         if (err)
1250                                 return err;
1251                 }
1252
1253                 for (h = 0; h <= ht->divisor; h++) {
1254                         for (n = rtnl_dereference(ht->ht[h]);
1255                              n;
1256                              n = rtnl_dereference(n->next)) {
1257                                 if (tc_skip_hw(n->flags))
1258                                         continue;
1259
1260                                 err = u32_reoffload_knode(tp, n, add, cb,
1261                                                           cb_priv, extack);
1262                                 if (err)
1263                                         return err;
1264                         }
1265                 }
1266
1267                 if (!add && !tc_skip_hw(ht->flags))
1268                         u32_reoffload_hnode(tp, ht, add, cb, cb_priv, extack);
1269         }
1270
1271         return 0;
1272 }
1273
1274 static void u32_bind_class(void *fh, u32 classid, unsigned long cl)
1275 {
1276         struct tc_u_knode *n = fh;
1277
1278         if (n && n->res.classid == classid)
1279                 n->res.class = cl;
1280 }
1281
1282 static int u32_dump(struct net *net, struct tcf_proto *tp, void *fh,
1283                     struct sk_buff *skb, struct tcmsg *t, bool rtnl_held)
1284 {
1285         struct tc_u_knode *n = fh;
1286         struct tc_u_hnode *ht_up, *ht_down;
1287         struct nlattr *nest;
1288
1289         if (n == NULL)
1290                 return skb->len;
1291
1292         t->tcm_handle = n->handle;
1293
1294         nest = nla_nest_start_noflag(skb, TCA_OPTIONS);
1295         if (nest == NULL)
1296                 goto nla_put_failure;
1297
1298         if (TC_U32_KEY(n->handle) == 0) {
1299                 struct tc_u_hnode *ht = fh;
1300                 u32 divisor = ht->divisor + 1;
1301
1302                 if (nla_put_u32(skb, TCA_U32_DIVISOR, divisor))
1303                         goto nla_put_failure;
1304         } else {
1305 #ifdef CONFIG_CLS_U32_PERF
1306                 struct tc_u32_pcnt *gpf;
1307                 int cpu;
1308 #endif
1309
1310                 if (nla_put(skb, TCA_U32_SEL,
1311                             sizeof(n->sel) + n->sel.nkeys*sizeof(struct tc_u32_key),
1312                             &n->sel))
1313                         goto nla_put_failure;
1314
1315                 ht_up = rtnl_dereference(n->ht_up);
1316                 if (ht_up) {
1317                         u32 htid = n->handle & 0xFFFFF000;
1318                         if (nla_put_u32(skb, TCA_U32_HASH, htid))
1319                                 goto nla_put_failure;
1320                 }
1321                 if (n->res.classid &&
1322                     nla_put_u32(skb, TCA_U32_CLASSID, n->res.classid))
1323                         goto nla_put_failure;
1324
1325                 ht_down = rtnl_dereference(n->ht_down);
1326                 if (ht_down &&
1327                     nla_put_u32(skb, TCA_U32_LINK, ht_down->handle))
1328                         goto nla_put_failure;
1329
1330                 if (n->flags && nla_put_u32(skb, TCA_U32_FLAGS, n->flags))
1331                         goto nla_put_failure;
1332
1333 #ifdef CONFIG_CLS_U32_MARK
1334                 if ((n->val || n->mask)) {
1335                         struct tc_u32_mark mark = {.val = n->val,
1336                                                    .mask = n->mask,
1337                                                    .success = 0};
1338                         int cpum;
1339
1340                         for_each_possible_cpu(cpum) {
1341                                 __u32 cnt = *per_cpu_ptr(n->pcpu_success, cpum);
1342
1343                                 mark.success += cnt;
1344                         }
1345
1346                         if (nla_put(skb, TCA_U32_MARK, sizeof(mark), &mark))
1347                                 goto nla_put_failure;
1348                 }
1349 #endif
1350
1351                 if (tcf_exts_dump(skb, &n->exts) < 0)
1352                         goto nla_put_failure;
1353
1354 #ifdef CONFIG_NET_CLS_IND
1355                 if (n->ifindex) {
1356                         struct net_device *dev;
1357                         dev = __dev_get_by_index(net, n->ifindex);
1358                         if (dev && nla_put_string(skb, TCA_U32_INDEV, dev->name))
1359                                 goto nla_put_failure;
1360                 }
1361 #endif
1362 #ifdef CONFIG_CLS_U32_PERF
1363                 gpf = kzalloc(sizeof(struct tc_u32_pcnt) +
1364                               n->sel.nkeys * sizeof(u64),
1365                               GFP_KERNEL);
1366                 if (!gpf)
1367                         goto nla_put_failure;
1368
1369                 for_each_possible_cpu(cpu) {
1370                         int i;
1371                         struct tc_u32_pcnt *pf = per_cpu_ptr(n->pf, cpu);
1372
1373                         gpf->rcnt += pf->rcnt;
1374                         gpf->rhit += pf->rhit;
1375                         for (i = 0; i < n->sel.nkeys; i++)
1376                                 gpf->kcnts[i] += pf->kcnts[i];
1377                 }
1378
1379                 if (nla_put_64bit(skb, TCA_U32_PCNT,
1380                                   sizeof(struct tc_u32_pcnt) +
1381                                   n->sel.nkeys * sizeof(u64),
1382                                   gpf, TCA_U32_PAD)) {
1383                         kfree(gpf);
1384                         goto nla_put_failure;
1385                 }
1386                 kfree(gpf);
1387 #endif
1388         }
1389
1390         nla_nest_end(skb, nest);
1391
1392         if (TC_U32_KEY(n->handle))
1393                 if (tcf_exts_dump_stats(skb, &n->exts) < 0)
1394                         goto nla_put_failure;
1395         return skb->len;
1396
1397 nla_put_failure:
1398         nla_nest_cancel(skb, nest);
1399         return -1;
1400 }
1401
1402 static struct tcf_proto_ops cls_u32_ops __read_mostly = {
1403         .kind           =       "u32",
1404         .classify       =       u32_classify,
1405         .init           =       u32_init,
1406         .destroy        =       u32_destroy,
1407         .get            =       u32_get,
1408         .change         =       u32_change,
1409         .delete         =       u32_delete,
1410         .walk           =       u32_walk,
1411         .reoffload      =       u32_reoffload,
1412         .dump           =       u32_dump,
1413         .bind_class     =       u32_bind_class,
1414         .owner          =       THIS_MODULE,
1415 };
1416
1417 static int __init init_u32(void)
1418 {
1419         int i, ret;
1420
1421         pr_info("u32 classifier\n");
1422 #ifdef CONFIG_CLS_U32_PERF
1423         pr_info("    Performance counters on\n");
1424 #endif
1425 #ifdef CONFIG_NET_CLS_IND
1426         pr_info("    input device check on\n");
1427 #endif
1428 #ifdef CONFIG_NET_CLS_ACT
1429         pr_info("    Actions configured\n");
1430 #endif
1431         tc_u_common_hash = kvmalloc_array(U32_HASH_SIZE,
1432                                           sizeof(struct hlist_head),
1433                                           GFP_KERNEL);
1434         if (!tc_u_common_hash)
1435                 return -ENOMEM;
1436
1437         for (i = 0; i < U32_HASH_SIZE; i++)
1438                 INIT_HLIST_HEAD(&tc_u_common_hash[i]);
1439
1440         ret = register_tcf_proto_ops(&cls_u32_ops);
1441         if (ret)
1442                 kvfree(tc_u_common_hash);
1443         return ret;
1444 }
1445
1446 static void __exit exit_u32(void)
1447 {
1448         unregister_tcf_proto_ops(&cls_u32_ops);
1449         kvfree(tc_u_common_hash);
1450 }
1451
1452 module_init(init_u32)
1453 module_exit(exit_u32)
1454 MODULE_LICENSE("GPL");