net/sched/cls_u32.c

   1 /*
   2  * net/sched/cls_u32.c  Ugly (or Universal) 32bit key Packet Classifier.
   3  *
   4  *              This program is free software; you can redistribute it and/or
   5  *              modify it under the terms of the GNU General Public License
   6  *              as published by the Free Software Foundation; either version
   7  *              2 of the License, or (at your option) any later version.
   8  *
   9  * Authors:     Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
  10  *
  11  *      The filters are packed to hash tables of key nodes
  12  *      with a set of 32bit key/mask pairs at every node.
  13  *      Nodes reference next level hash tables etc.
  14  *
  15  *      This scheme is the best universal classifier I managed to
  16  *      invent; it is not super-fast, but it is not slow (provided you
  17  *      program it correctly), and general enough.  And its relative
  18  *      speed grows as the number of rules becomes larger.
  19  *
  20  *      It seems that it represents the best middle point between
  21  *      speed and manageability both by human and by machine.
  22  *
  23  *      It is especially useful for link sharing combined with QoS;
  24  *      pure RSVP doesn't need such a general approach and can use
  25  *      much simpler (and faster) schemes, sort of cls_rsvp.c.
  26  *
  27  *      JHS: We should remove the CONFIG_NET_CLS_IND from here
  28  *      eventually when the meta match extension is made available
  29  *
  30  *      nfmark match added by Catalin(ux aka Dino) BOIE <catab at umbrella.ro>
  31  */
  32
  33 #include <linux/module.h>
  34 #include <linux/slab.h>
  35 #include <linux/types.h>
  36 #include <linux/kernel.h>
  37 #include <linux/string.h>
  38 #include <linux/errno.h>
  39 #include <linux/rtnetlink.h>
  40 #include <linux/skbuff.h>
  41 #include <linux/bitmap.h>
  42 #include <net/netlink.h>
  43 #include <net/act_api.h>
  44 #include <net/pkt_cls.h>
  45
  46 struct tc_u_knode {
  47         struct tc_u_knode       *next;
  48         u32                     handle;
  49         struct tc_u_hnode       *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       *ht_down;
  57 #ifdef CONFIG_CLS_U32_PERF
  58         struct tc_u32_pcnt      *pf;
  59 #endif
  60 #ifdef CONFIG_CLS_U32_MARK
  61         struct tc_u32_mark      mark;
  62 #endif
  63         struct tc_u32_sel       sel;
  64 };
  65
  66 struct tc_u_hnode {
  67         struct tc_u_hnode       *next;
  68         u32                     handle;
  69         u32                     prio;
  70         struct tc_u_common      *tp_c;
  71         int                     refcnt;
  72         unsigned int            divisor;
  73         struct tc_u_knode       *ht[1];
  74 };
  75
  76 struct tc_u_common {
  77         struct tc_u_hnode       *hlist;
  78         struct Qdisc            *q;
  79         int                     refcnt;
  80         u32                     hgenerator;
  81 };
  82
  83 static inline unsigned int u32_hash_fold(__be32 key,
  84                                          const struct tc_u32_sel *sel,
  85                                          u8 fshift)
  86 {
  87         unsigned int h = ntohl(key & sel->hmask) >> fshift;
  88
  89         return h;
  90 }
  91
  92 static int u32_classify(struct sk_buff *skb, const struct tcf_proto *tp, struct tcf_result *res)
  93 {
  94         struct {
  95                 struct tc_u_knode *knode;
  96                 unsigned int      off;
  97         } stack[TC_U32_MAXDEPTH];
  98
  99         struct tc_u_hnode *ht = tp->root;
 100         unsigned int off = skb_network_offset(skb);
 101         struct tc_u_knode *n;
 102         int sdepth = 0;
 103         int off2 = 0;
 104         int sel = 0;
 105 #ifdef CONFIG_CLS_U32_PERF
 106         int j;
 107 #endif
 108         int i, r;
 109
 110 next_ht:
 111         n = ht->ht[sel];
 112
 113 next_knode:
 114         if (n) {
 115                 struct tc_u32_key *key = n->sel.keys;
 116
 117 #ifdef CONFIG_CLS_U32_PERF
 118                 n->pf->rcnt += 1;
 119                 j = 0;
 120 #endif
 121
 122 #ifdef CONFIG_CLS_U32_MARK
 123                 if ((skb->mark & n->mark.mask) != n->mark.val) {
 124                         n = n->next;
 125                         goto next_knode;
 126                 } else {
 127                         n->mark.success++;
 128                 }
 129 #endif
 130
 131                 for (i = n->sel.nkeys; i > 0; i--, key++) {
 132                         int toff = off + key->off + (off2 & key->offmask);
 133                         __be32 *data, hdata;
 134
 135                         if (skb_headroom(skb) + toff > INT_MAX)
 136                                 goto out;
 137
 138                         data = skb_header_pointer(skb, toff, 4, &hdata);
 139                         if (!data)
 140                                 goto out;
 141                         if ((*data ^ key->val) & key->mask) {
 142                                 n = n->next;
 143                                 goto next_knode;
 144                         }
 145 #ifdef CONFIG_CLS_U32_PERF
 146                         n->pf->kcnts[j] += 1;
 147                         j++;
 148 #endif
 149                 }
 150                 if (n->ht_down == NULL) {
 151 check_terminal:
 152                         if (n->sel.flags & TC_U32_TERMINAL) {
 153
 154                                 *res = n->res;
 155 #ifdef CONFIG_NET_CLS_IND
 156                                 if (!tcf_match_indev(skb, n->ifindex)) {
 157                                         n = n->next;
 158                                         goto next_knode;
 159                                 }
 160 #endif
 161 #ifdef CONFIG_CLS_U32_PERF
 162                                 n->pf->rhit += 1;
 163 #endif
 164                                 r = tcf_exts_exec(skb, &n->exts, res);
 165                                 if (r < 0) {
 166                                         n = n->next;
 167                                         goto next_knode;
 168                                 }
 169
 170                                 return r;
 171                         }
 172                         n = n->next;
 173                         goto next_knode;
 174                 }
 175
 176                 /* PUSH */
 177                 if (sdepth >= TC_U32_MAXDEPTH)
 178                         goto deadloop;
 179                 stack[sdepth].knode = n;
 180                 stack[sdepth].off = off;
 181                 sdepth++;
 182
 183                 ht = n->ht_down;
 184                 sel = 0;
 185                 if (ht->divisor) {
 186                         __be32 *data, hdata;
 187
 188                         data = skb_header_pointer(skb, off + n->sel.hoff, 4,
 189                                                   &hdata);
 190                         if (!data)
 191                                 goto out;
 192                         sel = ht->divisor & u32_hash_fold(*data, &n->sel,
 193                                                           n->fshift);
 194                 }
 195                 if (!(n->sel.flags & (TC_U32_VAROFFSET | TC_U32_OFFSET | TC_U32_EAT)))
 196                         goto next_ht;
 197
 198                 if (n->sel.flags & (TC_U32_OFFSET | TC_U32_VAROFFSET)) {
 199                         off2 = n->sel.off + 3;
 200                         if (n->sel.flags & TC_U32_VAROFFSET) {
 201                                 __be16 *data, hdata;
 202
 203                                 data = skb_header_pointer(skb,
 204                                                           off + n->sel.offoff,
 205                                                           2, &hdata);
 206                                 if (!data)
 207                                         goto out;
 208                                 off2 += ntohs(n->sel.offmask & *data) >>
 209                                         n->sel.offshift;
 210                         }
 211                         off2 &= ~3;
 212                 }
 213                 if (n->sel.flags & TC_U32_EAT) {
 214                         off += off2;
 215                         off2 = 0;
 216                 }
 217
 218                 if (off < skb->len)
 219                         goto next_ht;
 220         }
 221
 222         /* POP */
 223         if (sdepth--) {
 224                 n = stack[sdepth].knode;
 225                 ht = n->ht_up;
 226                 off = stack[sdepth].off;
 227                 goto check_terminal;
 228         }
 229 out:
 230         return -1;
 231
 232 deadloop:
 233         net_warn_ratelimited("cls_u32: dead loop\n");
 234         return -1;
 235 }
 236
 237 static struct tc_u_hnode *
 238 u32_lookup_ht(struct tc_u_common *tp_c, u32 handle)
 239 {
 240         struct tc_u_hnode *ht;
 241
 242         for (ht = tp_c->hlist; ht; ht = ht->next)
 243                 if (ht->handle == handle)
 244                         break;
 245
 246         return ht;
 247 }
 248
 249 static struct tc_u_knode *
 250 u32_lookup_key(struct tc_u_hnode *ht, u32 handle)
 251 {
 252         unsigned int sel;
 253         struct tc_u_knode *n = NULL;
 254
 255         sel = TC_U32_HASH(handle);
 256         if (sel > ht->divisor)
 257                 goto out;
 258
 259         for (n = ht->ht[sel]; n; n = n->next)
 260                 if (n->handle == handle)
 261                         break;
 262 out:
 263         return n;
 264 }
 265
 266
 267 static unsigned long u32_get(struct tcf_proto *tp, u32 handle)
 268 {
 269         struct tc_u_hnode *ht;
 270         struct tc_u_common *tp_c = tp->data;
 271
 272         if (TC_U32_HTID(handle) == TC_U32_ROOT)
 273                 ht = tp->root;
 274         else
 275                 ht = u32_lookup_ht(tp_c, TC_U32_HTID(handle));
 276
 277         if (!ht)
 278                 return 0;
 279
 280         if (TC_U32_KEY(handle) == 0)
 281                 return (unsigned long)ht;
 282
 283         return (unsigned long)u32_lookup_key(ht, handle);
 284 }
 285
 286 static void u32_put(struct tcf_proto *tp, unsigned long f)
 287 {
 288 }
 289
 290 static u32 gen_new_htid(struct tc_u_common *tp_c)
 291 {
 292         int i = 0x800;
 293
 294         do {
 295                 if (++tp_c->hgenerator == 0x7FF)
 296                         tp_c->hgenerator = 1;
 297         } while (--i > 0 && u32_lookup_ht(tp_c, (tp_c->hgenerator|0x800)<<20));
 298
 299         return i > 0 ? (tp_c->hgenerator|0x800)<<20 : 0;
 300 }
 301
 302 static int u32_init(struct tcf_proto *tp)
 303 {
 304         struct tc_u_hnode *root_ht;
 305         struct tc_u_common *tp_c;
 306
 307         tp_c = tp->q->u32_node;
 308
 309         root_ht = kzalloc(sizeof(*root_ht), GFP_KERNEL);
 310         if (root_ht == NULL)
 311                 return -ENOBUFS;
 312
 313         root_ht->divisor = 0;
 314         root_ht->refcnt++;
 315         root_ht->handle = tp_c ? gen_new_htid(tp_c) : 0x80000000;
 316         root_ht->prio = tp->prio;
 317
 318         if (tp_c == NULL) {
 319                 tp_c = kzalloc(sizeof(*tp_c), GFP_KERNEL);
 320                 if (tp_c == NULL) {
 321                         kfree(root_ht);
 322                         return -ENOBUFS;
 323                 }
 324                 tp_c->q = tp->q;
 325                 tp->q->u32_node = tp_c;
 326         }
 327
 328         tp_c->refcnt++;
 329         root_ht->next = tp_c->hlist;
 330         tp_c->hlist = root_ht;
 331         root_ht->tp_c = tp_c;
 332
 333         tp->root = root_ht;
 334         tp->data = tp_c;
 335         return 0;
 336 }
 337
 338 static int u32_destroy_key(struct tcf_proto *tp, struct tc_u_knode *n)
 339 {
 340         tcf_unbind_filter(tp, &n->res);
 341         tcf_exts_destroy(tp, &n->exts);
 342         if (n->ht_down)
 343                 n->ht_down->refcnt--;
 344 #ifdef CONFIG_CLS_U32_PERF
 345         kfree(n->pf);
 346 #endif
 347         kfree(n);
 348         return 0;
 349 }
 350
 351 static int u32_delete_key(struct tcf_proto *tp, struct tc_u_knode *key)
 352 {
 353         struct tc_u_knode **kp;
 354         struct tc_u_hnode *ht = key->ht_up;
 355
 356         if (ht) {
 357                 for (kp = &ht->ht[TC_U32_HASH(key->handle)]; *kp; kp = &(*kp)->next) {
 358                         if (*kp == key) {
 359                                 tcf_tree_lock(tp);
 360                                 *kp = key->next;
 361                                 tcf_tree_unlock(tp);
 362
 363                                 u32_destroy_key(tp, key);
 364                                 return 0;
 365                         }
 366                 }
 367         }
 368         WARN_ON(1);
 369         return 0;
 370 }
 371
 372 static void u32_clear_hnode(struct tcf_proto *tp, struct tc_u_hnode *ht)
 373 {
 374         struct tc_u_knode *n;
 375         unsigned int h;
 376
 377         for (h = 0; h <= ht->divisor; h++) {
 378                 while ((n = ht->ht[h]) != NULL) {
 379                         ht->ht[h] = n->next;
 380
 381                         u32_destroy_key(tp, n);
 382                 }
 383         }
 384 }
 385
 386 static int u32_destroy_hnode(struct tcf_proto *tp, struct tc_u_hnode *ht)
 387 {
 388         struct tc_u_common *tp_c = tp->data;
 389         struct tc_u_hnode **hn;
 390
 391         WARN_ON(ht->refcnt);
 392
 393         u32_clear_hnode(tp, ht);
 394
 395         for (hn = &tp_c->hlist; *hn; hn = &(*hn)->next) {
 396                 if (*hn == ht) {
 397                         *hn = ht->next;
 398                         kfree(ht);
 399                         return 0;
 400                 }
 401         }
 402
 403         WARN_ON(1);
 404         return -ENOENT;
 405 }
 406
 407 static void u32_destroy(struct tcf_proto *tp)
 408 {
 409         struct tc_u_common *tp_c = tp->data;
 410         struct tc_u_hnode *root_ht = tp->root;
 411
 412         WARN_ON(root_ht == NULL);
 413
 414         if (root_ht && --root_ht->refcnt == 0)
 415                 u32_destroy_hnode(tp, root_ht);
 416
 417         if (--tp_c->refcnt == 0) {
 418                 struct tc_u_hnode *ht;
 419
 420                 tp->q->u32_node = NULL;
 421
 422                 for (ht = tp_c->hlist; ht; ht = ht->next) {
 423                         ht->refcnt--;
 424                         u32_clear_hnode(tp, ht);
 425                 }
 426
 427                 while ((ht = tp_c->hlist) != NULL) {
 428                         tp_c->hlist = ht->next;
 429
 430                         WARN_ON(ht->refcnt != 0);
 431
 432                         kfree(ht);
 433                 }
 434
 435                 kfree(tp_c);
 436         }
 437
 438         tp->data = NULL;
 439 }
 440
 441 static int u32_delete(struct tcf_proto *tp, unsigned long arg)
 442 {
 443         struct tc_u_hnode *ht = (struct tc_u_hnode *)arg;
 444
 445         if (ht == NULL)
 446                 return 0;
 447
 448         if (TC_U32_KEY(ht->handle))
 449                 return u32_delete_key(tp, (struct tc_u_knode *)ht);
 450
 451         if (tp->root == ht)
 452                 return -EINVAL;
 453
 454         if (ht->refcnt == 1) {
 455                 ht->refcnt--;
 456                 u32_destroy_hnode(tp, ht);
 457         } else {
 458                 return -EBUSY;
 459         }
 460
 461         return 0;
 462 }
 463
 464 #define NR_U32_NODE (1<<12)
 465 static u32 gen_new_kid(struct tc_u_hnode *ht, u32 handle)
 466 {
 467         struct tc_u_knode *n;
 468         unsigned long i;
 469         unsigned long *bitmap = kzalloc(BITS_TO_LONGS(NR_U32_NODE) * sizeof(unsigned long),
 470                                         GFP_KERNEL);
 471         if (!bitmap)
 472                 return handle | 0xFFF;
 473
 474         for (n = ht->ht[TC_U32_HASH(handle)]; n; n = n->next)
 475                 set_bit(TC_U32_NODE(n->handle), bitmap);
 476
 477         i = find_next_zero_bit(bitmap, NR_U32_NODE, 0x800);
 478         if (i >= NR_U32_NODE)
 479                 i = find_next_zero_bit(bitmap, NR_U32_NODE, 1);
 480
 481         kfree(bitmap);
 482         return handle | (i >= NR_U32_NODE ? 0xFFF : i);
 483 }
 484
 485 static const struct nla_policy u32_policy[TCA_U32_MAX + 1] = {
 486         [TCA_U32_CLASSID]       = { .type = NLA_U32 },
 487         [TCA_U32_HASH]          = { .type = NLA_U32 },
 488         [TCA_U32_LINK]          = { .type = NLA_U32 },
 489         [TCA_U32_DIVISOR]       = { .type = NLA_U32 },
 490         [TCA_U32_SEL]           = { .len = sizeof(struct tc_u32_sel) },
 491         [TCA_U32_INDEV]         = { .type = NLA_STRING, .len = IFNAMSIZ },
 492         [TCA_U32_MARK]          = { .len = sizeof(struct tc_u32_mark) },
 493 };
 494
 495 static int u32_set_parms(struct net *net, struct tcf_proto *tp,
 496                          unsigned long base, struct tc_u_hnode *ht,
 497                          struct tc_u_knode *n, struct nlattr **tb,
 498                          struct nlattr *est, bool ovr)
 499 {
 500         int err;
 501         struct tcf_exts e;
 502
 503         tcf_exts_init(&e, TCA_U32_ACT, TCA_U32_POLICE);
 504         err = tcf_exts_validate(net, tp, tb, est, &e, ovr);
 505         if (err < 0)
 506                 return err;
 507
 508         err = -EINVAL;
 509         if (tb[TCA_U32_LINK]) {
 510                 u32 handle = nla_get_u32(tb[TCA_U32_LINK]);
 511                 struct tc_u_hnode *ht_down = NULL, *ht_old;
 512
 513                 if (TC_U32_KEY(handle))
 514                         goto errout;
 515
 516                 if (handle) {
 517                         ht_down = u32_lookup_ht(ht->tp_c, handle);
 518
 519                         if (ht_down == NULL)
 520                                 goto errout;
 521                         ht_down->refcnt++;
 522                 }
 523
 524                 tcf_tree_lock(tp);
 525                 ht_old = n->ht_down;
 526                 n->ht_down = ht_down;
 527                 tcf_tree_unlock(tp);
 528
 529                 if (ht_old)
 530                         ht_old->refcnt--;
 531         }
 532         if (tb[TCA_U32_CLASSID]) {
 533                 n->res.classid = nla_get_u32(tb[TCA_U32_CLASSID]);
 534                 tcf_bind_filter(tp, &n->res, base);
 535         }
 536
 537 #ifdef CONFIG_NET_CLS_IND
 538         if (tb[TCA_U32_INDEV]) {
 539                 int ret;
 540                 ret = tcf_change_indev(net, tb[TCA_U32_INDEV]);
 541                 if (ret < 0)
 542                         goto errout;
 543                 n->ifindex = ret;
 544         }
 545 #endif
 546         tcf_exts_change(tp, &n->exts, &e);
 547
 548         return 0;
 549 errout:
 550         tcf_exts_destroy(tp, &e);
 551         return err;
 552 }
 553
 554 static int u32_change(struct net *net, struct sk_buff *in_skb,
 555                       struct tcf_proto *tp, unsigned long base, u32 handle,
 556                       struct nlattr **tca,
 557                       unsigned long *arg, bool ovr)
 558 {
 559         struct tc_u_common *tp_c = tp->data;
 560         struct tc_u_hnode *ht;
 561         struct tc_u_knode *n;
 562         struct tc_u32_sel *s;
 563         struct nlattr *opt = tca[TCA_OPTIONS];
 564         struct nlattr *tb[TCA_U32_MAX + 1];
 565         u32 htid;
 566         int err;
 567
 568         if (opt == NULL)
 569                 return handle ? -EINVAL : 0;
 570
 571         err = nla_parse_nested(tb, TCA_U32_MAX, opt, u32_policy);
 572         if (err < 0)
 573                 return err;
 574
 575         n = (struct tc_u_knode *)*arg;
 576         if (n) {
 577                 if (TC_U32_KEY(n->handle) == 0)
 578                         return -EINVAL;
 579
 580                 return u32_set_parms(net, tp, base, n->ht_up, n, tb,
 581                                      tca[TCA_RATE], ovr);
 582         }
 583
 584         if (tb[TCA_U32_DIVISOR]) {
 585                 unsigned int divisor = nla_get_u32(tb[TCA_U32_DIVISOR]);
 586
 587                 if (--divisor > 0x100)
 588                         return -EINVAL;
 589                 if (TC_U32_KEY(handle))
 590                         return -EINVAL;
 591                 if (handle == 0) {
 592                         handle = gen_new_htid(tp->data);
 593                         if (handle == 0)
 594                                 return -ENOMEM;
 595                 }
 596                 ht = kzalloc(sizeof(*ht) + divisor*sizeof(void *), GFP_KERNEL);
 597                 if (ht == NULL)
 598                         return -ENOBUFS;
 599                 ht->tp_c = tp_c;
 600                 ht->refcnt = 1;
 601                 ht->divisor = divisor;
 602                 ht->handle = handle;
 603                 ht->prio = tp->prio;
 604                 ht->next = tp_c->hlist;
 605                 tp_c->hlist = ht;
 606                 *arg = (unsigned long)ht;
 607                 return 0;
 608         }
 609
 610         if (tb[TCA_U32_HASH]) {
 611                 htid = nla_get_u32(tb[TCA_U32_HASH]);
 612                 if (TC_U32_HTID(htid) == TC_U32_ROOT) {
 613                         ht = tp->root;
 614                         htid = ht->handle;
 615                 } else {
 616                         ht = u32_lookup_ht(tp->data, TC_U32_HTID(htid));
 617                         if (ht == NULL)
 618                                 return -EINVAL;
 619                 }
 620         } else {
 621                 ht = tp->root;
 622                 htid = ht->handle;
 623         }
 624
 625         if (ht->divisor < TC_U32_HASH(htid))
 626                 return -EINVAL;
 627
 628         if (handle) {
 629                 if (TC_U32_HTID(handle) && TC_U32_HTID(handle^htid))
 630                         return -EINVAL;
 631                 handle = htid | TC_U32_NODE(handle);
 632         } else
 633                 handle = gen_new_kid(ht, htid);
 634
 635         if (tb[TCA_U32_SEL] == NULL)
 636                 return -EINVAL;
 637
 638         s = nla_data(tb[TCA_U32_SEL]);
 639
 640         n = kzalloc(sizeof(*n) + s->nkeys*sizeof(struct tc_u32_key), GFP_KERNEL);
 641         if (n == NULL)
 642                 return -ENOBUFS;
 643
 644 #ifdef CONFIG_CLS_U32_PERF
 645         n->pf = kzalloc(sizeof(struct tc_u32_pcnt) + s->nkeys*sizeof(u64), GFP_KERNEL);
 646         if (n->pf == NULL) {
 647                 kfree(n);
 648                 return -ENOBUFS;
 649         }
 650 #endif
 651
 652         memcpy(&n->sel, s, sizeof(*s) + s->nkeys*sizeof(struct tc_u32_key));
 653         n->ht_up = ht;
 654         n->handle = handle;
 655         n->fshift = s->hmask ? ffs(ntohl(s->hmask)) - 1 : 0;
 656         tcf_exts_init(&n->exts, TCA_U32_ACT, TCA_U32_POLICE);
 657
 658 #ifdef CONFIG_CLS_U32_MARK
 659         if (tb[TCA_U32_MARK]) {
 660                 struct tc_u32_mark *mark;
 661
 662                 mark = nla_data(tb[TCA_U32_MARK]);
 663                 memcpy(&n->mark, mark, sizeof(struct tc_u32_mark));
 664                 n->mark.success = 0;
 665         }
 666 #endif
 667
 668         err = u32_set_parms(net, tp, base, ht, n, tb, tca[TCA_RATE], ovr);
 669         if (err == 0) {
 670                 struct tc_u_knode **ins;
 671                 for (ins = &ht->ht[TC_U32_HASH(handle)]; *ins; ins = &(*ins)->next)
 672                         if (TC_U32_NODE(handle) < TC_U32_NODE((*ins)->handle))
 673                                 break;
 674
 675                 n->next = *ins;
 676                 tcf_tree_lock(tp);
 677                 *ins = n;
 678                 tcf_tree_unlock(tp);
 679
 680                 *arg = (unsigned long)n;
 681                 return 0;
 682         }
 683 #ifdef CONFIG_CLS_U32_PERF
 684         kfree(n->pf);
 685 #endif
 686         kfree(n);
 687         return err;
 688 }
 689
 690 static void u32_walk(struct tcf_proto *tp, struct tcf_walker *arg)
 691 {
 692         struct tc_u_common *tp_c = tp->data;
 693         struct tc_u_hnode *ht;
 694         struct tc_u_knode *n;
 695         unsigned int h;
 696
 697         if (arg->stop)
 698                 return;
 699
 700         for (ht = tp_c->hlist; ht; ht = ht->next) {
 701                 if (ht->prio != tp->prio)
 702                         continue;
 703                 if (arg->count >= arg->skip) {
 704                         if (arg->fn(tp, (unsigned long)ht, arg) < 0) {
 705                                 arg->stop = 1;
 706                                 return;
 707                         }
 708                 }
 709                 arg->count++;
 710                 for (h = 0; h <= ht->divisor; h++) {
 711                         for (n = ht->ht[h]; n; n = n->next) {
 712                                 if (arg->count < arg->skip) {
 713                                         arg->count++;
 714                                         continue;
 715                                 }
 716                                 if (arg->fn(tp, (unsigned long)n, arg) < 0) {
 717                                         arg->stop = 1;
 718                                         return;
 719                                 }
 720                                 arg->count++;
 721                         }
 722                 }
 723         }
 724 }
 725
 726 static int u32_dump(struct net *net, struct tcf_proto *tp, unsigned long fh,
 727                      struct sk_buff *skb, struct tcmsg *t)
 728 {
 729         struct tc_u_knode *n = (struct tc_u_knode *)fh;
 730         struct nlattr *nest;
 731
 732         if (n == NULL)
 733                 return skb->len;
 734
 735         t->tcm_handle = n->handle;
 736
 737         nest = nla_nest_start(skb, TCA_OPTIONS);
 738         if (nest == NULL)
 739                 goto nla_put_failure;
 740
 741         if (TC_U32_KEY(n->handle) == 0) {
 742                 struct tc_u_hnode *ht = (struct tc_u_hnode *)fh;
 743                 u32 divisor = ht->divisor + 1;
 744
 745                 if (nla_put_u32(skb, TCA_U32_DIVISOR, divisor))
 746                         goto nla_put_failure;
 747         } else {
 748                 if (nla_put(skb, TCA_U32_SEL,
 749                             sizeof(n->sel) + n->sel.nkeys*sizeof(struct tc_u32_key),
 750                             &n->sel))
 751                         goto nla_put_failure;
 752                 if (n->ht_up) {
 753                         u32 htid = n->handle & 0xFFFFF000;
 754                         if (nla_put_u32(skb, TCA_U32_HASH, htid))
 755                                 goto nla_put_failure;
 756                 }
 757                 if (n->res.classid &&
 758                     nla_put_u32(skb, TCA_U32_CLASSID, n->res.classid))
 759                         goto nla_put_failure;
 760                 if (n->ht_down &&
 761                     nla_put_u32(skb, TCA_U32_LINK, n->ht_down->handle))
 762                         goto nla_put_failure;
 763
 764 #ifdef CONFIG_CLS_U32_MARK
 765                 if ((n->mark.val || n->mark.mask) &&
 766                     nla_put(skb, TCA_U32_MARK, sizeof(n->mark), &n->mark))
 767                         goto nla_put_failure;
 768 #endif
 769
 770                 if (tcf_exts_dump(skb, &n->exts) < 0)
 771                         goto nla_put_failure;
 772
 773 #ifdef CONFIG_NET_CLS_IND
 774                 if (n->ifindex) {
 775                         struct net_device *dev;
 776                         dev = __dev_get_by_index(net, n->ifindex);
 777                         if (dev && nla_put_string(skb, TCA_U32_INDEV, dev->name))
 778                                 goto nla_put_failure;
 779                 }
 780 #endif
 781 #ifdef CONFIG_CLS_U32_PERF
 782                 if (nla_put(skb, TCA_U32_PCNT,
 783                             sizeof(struct tc_u32_pcnt) + n->sel.nkeys*sizeof(u64),
 784                             n->pf))
 785                         goto nla_put_failure;
 786 #endif
 787         }
 788
 789         nla_nest_end(skb, nest);
 790
 791         if (TC_U32_KEY(n->handle))
 792                 if (tcf_exts_dump_stats(skb, &n->exts) < 0)
 793                         goto nla_put_failure;
 794         return skb->len;
 795
 796 nla_put_failure:
 797         nla_nest_cancel(skb, nest);
 798         return -1;
 799 }
 800
 801 static struct tcf_proto_ops cls_u32_ops __read_mostly = {
 802         .kind           =       "u32",
 803         .classify       =       u32_classify,
 804         .init           =       u32_init,
 805         .destroy        =       u32_destroy,
 806         .get            =       u32_get,
 807         .put            =       u32_put,
 808         .change         =       u32_change,
 809         .delete         =       u32_delete,
 810         .walk           =       u32_walk,
 811         .dump           =       u32_dump,
 812         .owner          =       THIS_MODULE,
 813 };
 814
 815 static int __init init_u32(void)
 816 {
 817         pr_info("u32 classifier\n");
 818 #ifdef CONFIG_CLS_U32_PERF
 819         pr_info("    Performance counters on\n");
 820 #endif
 821 #ifdef CONFIG_NET_CLS_IND
 822         pr_info("    input device check on\n");
 823 #endif
 824 #ifdef CONFIG_NET_CLS_ACT
 825         pr_info("    Actions configured\n");
 826 #endif
 827         return register_tcf_proto_ops(&cls_u32_ops);
 828 }
 829
 830 static void __exit exit_u32(void)
 831 {
 832         unregister_tcf_proto_ops(&cls_u32_ops);
 833 }
 834
 835 module_init(init_u32)
 836 module_exit(exit_u32)
 837 MODULE_LICENSE("GPL");