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   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 <asm/uaccess.h>
  34 #include <asm/system.h>
  35 #include <linux/bitops.h>
  36 #include <linux/module.h>
  37 #include <linux/types.h>
  38 #include <linux/kernel.h>
  39 #include <linux/sched.h>
  40 #include <linux/string.h>
  41 #include <linux/mm.h>
  42 #include <linux/socket.h>
  43 #include <linux/sockios.h>
  44 #include <linux/in.h>
  45 #include <linux/errno.h>
  46 #include <linux/interrupt.h>
  47 #include <linux/if_ether.h>
  48 #include <linux/inet.h>
  49 #include <linux/netdevice.h>
  50 #include <linux/etherdevice.h>
  51 #include <linux/notifier.h>
  52 #include <linux/rtnetlink.h>
  53 #include <net/ip.h>
  54 #include <net/route.h>
  55 #include <linux/skbuff.h>
  56 #include <net/sock.h>
  57 #include <net/act_api.h>
  58 #include <net/pkt_cls.h>
  59
  60 struct tc_u_knode
  61 {
  62         struct tc_u_knode       *next;
  63         u32                     handle;
  64         struct tc_u_hnode       *ht_up;
  65         struct tcf_exts         exts;
  66 #ifdef CONFIG_NET_CLS_IND
  67         char                     indev[IFNAMSIZ];
  68 #endif
  69         u8                      fshift;
  70         struct tcf_result       res;
  71         struct tc_u_hnode       *ht_down;
  72 #ifdef CONFIG_CLS_U32_PERF
  73         struct tc_u32_pcnt      *pf;
  74 #endif
  75 #ifdef CONFIG_CLS_U32_MARK
  76         struct tc_u32_mark      mark;
  77 #endif
  78         struct tc_u32_sel       sel;
  79 };
  80
  81 struct tc_u_hnode
  82 {
  83         struct tc_u_hnode       *next;
  84         u32                     handle;
  85         u32                     prio;
  86         struct tc_u_common      *tp_c;
  87         int                     refcnt;
  88         unsigned                divisor;
  89         struct tc_u_knode       *ht[1];
  90 };
  91
  92 struct tc_u_common
  93 {
  94         struct tc_u_common      *next;
  95         struct tc_u_hnode       *hlist;
  96         struct Qdisc            *q;
  97         int                     refcnt;
  98         u32                     hgenerator;
  99 };
 100
 101 static struct tcf_ext_map u32_ext_map = {
 102         .action = TCA_U32_ACT,
 103         .police = TCA_U32_POLICE
 104 };
 105
 106 static struct tc_u_common *u32_list;
 107
 108 static __inline__ unsigned u32_hash_fold(u32 key, struct tc_u32_sel *sel, u8 fshift)
 109 {
 110         unsigned h = (key & sel->hmask)>>fshift;
 111
 112         return h;
 113 }
 114
 115 static int u32_classify(struct sk_buff *skb, struct tcf_proto *tp, struct tcf_result *res)
 116 {
 117         struct {
 118                 struct tc_u_knode *knode;
 119                 u8                *ptr;
 120         } stack[TC_U32_MAXDEPTH];
 121
 122         struct tc_u_hnode *ht = (struct tc_u_hnode*)tp->root;
 123         u8 *ptr = skb->nh.raw;
 124         struct tc_u_knode *n;
 125         int sdepth = 0;
 126         int off2 = 0;
 127         int sel = 0;
 128 #ifdef CONFIG_CLS_U32_PERF
 129         int j;
 130 #endif
 131         int i, r;
 132
 133 next_ht:
 134         n = ht->ht[sel];
 135
 136 next_knode:
 137         if (n) {
 138                 struct tc_u32_key *key = n->sel.keys;
 139
 140 #ifdef CONFIG_CLS_U32_PERF
 141                 n->pf->rcnt +=1;
 142                 j = 0;
 143 #endif
 144
 145 #ifdef CONFIG_CLS_U32_MARK
 146                 if ((skb->nfmark & n->mark.mask) != n->mark.val) {
 147                         n = n->next;
 148                         goto next_knode;
 149                 } else {
 150                         n->mark.success++;
 151                 }
 152 #endif
 153
 154                 for (i = n->sel.nkeys; i>0; i--, key++) {
 155
 156                         if ((*(u32*)(ptr+key->off+(off2&key->offmask))^key->val)&key->mask) {
 157                                 n = n->next;
 158                                 goto next_knode;
 159                         }
 160 #ifdef CONFIG_CLS_U32_PERF
 161                         n->pf->kcnts[j] +=1;
 162                         j++;
 163 #endif
 164                 }
 165                 if (n->ht_down == NULL) {
 166 check_terminal:
 167                         if (n->sel.flags&TC_U32_TERMINAL) {
 168
 169                                 *res = n->res;
 170 #ifdef CONFIG_NET_CLS_IND
 171                                 if (!tcf_match_indev(skb, n->indev)) {
 172                                         n = n->next;
 173                                         goto next_knode;
 174                                 }
 175 #endif
 176 #ifdef CONFIG_CLS_U32_PERF
 177                                 n->pf->rhit +=1;
 178 #endif
 179                                 r = tcf_exts_exec(skb, &n->exts, res);
 180                                 if (r < 0) {
 181                                         n = n->next;
 182                                         goto next_knode;
 183                                 }
 184
 185                                 return r;
 186                         }
 187                         n = n->next;
 188                         goto next_knode;
 189                 }
 190
 191                 /* PUSH */
 192                 if (sdepth >= TC_U32_MAXDEPTH)
 193                         goto deadloop;
 194                 stack[sdepth].knode = n;
 195                 stack[sdepth].ptr = ptr;
 196                 sdepth++;
 197
 198                 ht = n->ht_down;
 199                 sel = 0;
 200                 if (ht->divisor)
 201                         sel = ht->divisor&u32_hash_fold(*(u32*)(ptr+n->sel.hoff), &n->sel,n->fshift);
 202
 203                 if (!(n->sel.flags&(TC_U32_VAROFFSET|TC_U32_OFFSET|TC_U32_EAT)))
 204                         goto next_ht;
 205
 206                 if (n->sel.flags&(TC_U32_OFFSET|TC_U32_VAROFFSET)) {
 207                         off2 = n->sel.off + 3;
 208                         if (n->sel.flags&TC_U32_VAROFFSET)
 209                                 off2 += ntohs(n->sel.offmask & *(u16*)(ptr+n->sel.offoff)) >>n->sel.offshift;
 210                         off2 &= ~3;
 211                 }
 212                 if (n->sel.flags&TC_U32_EAT) {
 213                         ptr += off2;
 214                         off2 = 0;
 215                 }
 216
 217                 if (ptr < skb->tail)
 218                         goto next_ht;
 219         }
 220
 221         /* POP */
 222         if (sdepth--) {
 223                 n = stack[sdepth].knode;
 224                 ht = n->ht_up;
 225                 ptr = stack[sdepth].ptr;
 226                 goto check_terminal;
 227         }
 228         return -1;
 229
 230 deadloop:
 231         if (net_ratelimit())
 232                 printk("cls_u32: dead loop\n");
 233         return -1;
 234 }
 235
 236 static __inline__ struct tc_u_hnode *
 237 u32_lookup_ht(struct tc_u_common *tp_c, u32 handle)
 238 {
 239         struct tc_u_hnode *ht;
 240
 241         for (ht = tp_c->hlist; ht; ht = ht->next)
 242                 if (ht->handle == handle)
 243                         break;
 244
 245         return ht;
 246 }
 247
 248 static __inline__ struct tc_u_knode *
 249 u32_lookup_key(struct tc_u_hnode *ht, u32 handle)
 250 {
 251         unsigned sel;
 252         struct tc_u_knode *n = NULL;
 253
 254         sel = TC_U32_HASH(handle);
 255         if (sel > ht->divisor)
 256                 goto out;
 257
 258         for (n = ht->ht[sel]; n; n = n->next)
 259                 if (n->handle == handle)
 260                         break;
 261 out:
 262         return n;
 263 }
 264
 265
 266 static unsigned long u32_get(struct tcf_proto *tp, u32 handle)
 267 {
 268         struct tc_u_hnode *ht;
 269         struct tc_u_common *tp_c = tp->data;
 270
 271         if (TC_U32_HTID(handle) == TC_U32_ROOT)
 272                 ht = tp->root;
 273         else
 274                 ht = u32_lookup_ht(tp_c, TC_U32_HTID(handle));
 275
 276         if (!ht)
 277                 return 0;
 278
 279         if (TC_U32_KEY(handle) == 0)
 280                 return (unsigned long)ht;
 281
 282         return (unsigned long)u32_lookup_key(ht, handle);
 283 }
 284
 285 static void u32_put(struct tcf_proto *tp, unsigned long f)
 286 {
 287 }
 288
 289 static u32 gen_new_htid(struct tc_u_common *tp_c)
 290 {
 291         int i = 0x800;
 292
 293         do {
 294                 if (++tp_c->hgenerator == 0x7FF)
 295                         tp_c->hgenerator = 1;
 296         } while (--i>0 && u32_lookup_ht(tp_c, (tp_c->hgenerator|0x800)<<20));
 297
 298         return i > 0 ? (tp_c->hgenerator|0x800)<<20 : 0;
 299 }
 300
 301 static int u32_init(struct tcf_proto *tp)
 302 {
 303         struct tc_u_hnode *root_ht;
 304         struct tc_u_common *tp_c;
 305
 306         for (tp_c = u32_list; tp_c; tp_c = tp_c->next)
 307                 if (tp_c->q == tp->q)
 308                         break;
 309
 310         root_ht = kzalloc(sizeof(*root_ht), GFP_KERNEL);
 311         if (root_ht == NULL)
 312                 return -ENOBUFS;
 313
 314         root_ht->divisor = 0;
 315         root_ht->refcnt++;
 316         root_ht->handle = tp_c ? gen_new_htid(tp_c) : 0x80000000;
 317         root_ht->prio = tp->prio;
 318
 319         if (tp_c == NULL) {
 320                 tp_c = kzalloc(sizeof(*tp_c), GFP_KERNEL);
 321                 if (tp_c == NULL) {
 322                         kfree(root_ht);
 323                         return -ENOBUFS;
 324                 }
 325                 tp_c->q = tp->q;
 326                 tp_c->next = u32_list;
 327                 u32_list = tp_c;
 328         }
 329
 330         tp_c->refcnt++;
 331         root_ht->next = tp_c->hlist;
 332         tp_c->hlist = root_ht;
 333         root_ht->tp_c = tp_c;
 334
 335         tp->root = root_ht;
 336         tp->data = tp_c;
 337         return 0;
 338 }
 339
 340 static int u32_destroy_key(struct tcf_proto *tp, struct tc_u_knode *n)
 341 {
 342         tcf_unbind_filter(tp, &n->res);
 343         tcf_exts_destroy(tp, &n->exts);
 344         if (n->ht_down)
 345                 n->ht_down->refcnt--;
 346 #ifdef CONFIG_CLS_U32_PERF
 347         kfree(n->pf);
 348 #endif
 349         kfree(n);
 350         return 0;
 351 }
 352
 353 static int u32_delete_key(struct tcf_proto *tp, struct tc_u_knode* key)
 354 {
 355         struct tc_u_knode **kp;
 356         struct tc_u_hnode *ht = key->ht_up;
 357
 358         if (ht) {
 359                 for (kp = &ht->ht[TC_U32_HASH(key->handle)]; *kp; kp = &(*kp)->next) {
 360                         if (*kp == key) {
 361                                 tcf_tree_lock(tp);
 362                                 *kp = key->next;
 363                                 tcf_tree_unlock(tp);
 364
 365                                 u32_destroy_key(tp, key);
 366                                 return 0;
 367                         }
 368                 }
 369         }
 370         BUG_TRAP(0);
 371         return 0;
 372 }
 373
 374 static void u32_clear_hnode(struct tcf_proto *tp, struct tc_u_hnode *ht)
 375 {
 376         struct tc_u_knode *n;
 377         unsigned h;
 378
 379         for (h=0; h<=ht->divisor; h++) {
 380                 while ((n = ht->ht[h]) != NULL) {
 381                         ht->ht[h] = n->next;
 382
 383                         u32_destroy_key(tp, n);
 384                 }
 385         }
 386 }
 387
 388 static int u32_destroy_hnode(struct tcf_proto *tp, struct tc_u_hnode *ht)
 389 {
 390         struct tc_u_common *tp_c = tp->data;
 391         struct tc_u_hnode **hn;
 392
 393         BUG_TRAP(!ht->refcnt);
 394
 395         u32_clear_hnode(tp, ht);
 396
 397         for (hn = &tp_c->hlist; *hn; hn = &(*hn)->next) {
 398                 if (*hn == ht) {
 399                         *hn = ht->next;
 400                         kfree(ht);
 401                         return 0;
 402                 }
 403         }
 404
 405         BUG_TRAP(0);
 406         return -ENOENT;
 407 }
 408
 409 static void u32_destroy(struct tcf_proto *tp)
 410 {
 411         struct tc_u_common *tp_c = tp->data;
 412         struct tc_u_hnode *root_ht = xchg(&tp->root, NULL);
 413
 414         BUG_TRAP(root_ht != NULL);
 415
 416         if (root_ht && --root_ht->refcnt == 0)
 417                 u32_destroy_hnode(tp, root_ht);
 418
 419         if (--tp_c->refcnt == 0) {
 420                 struct tc_u_hnode *ht;
 421                 struct tc_u_common **tp_cp;
 422
 423                 for (tp_cp = &u32_list; *tp_cp; tp_cp = &(*tp_cp)->next) {
 424                         if (*tp_cp == tp_c) {
 425                                 *tp_cp = tp_c->next;
 426                                 break;
 427                         }
 428                 }
 429
 430                 for (ht=tp_c->hlist; ht; ht = ht->next)
 431                         u32_clear_hnode(tp, ht);
 432
 433                 while ((ht = tp_c->hlist) != NULL) {
 434                         tp_c->hlist = ht->next;
 435
 436                         BUG_TRAP(ht->refcnt == 0);
 437
 438                         kfree(ht);
 439                 };
 440
 441                 kfree(tp_c);
 442         }
 443
 444         tp->data = NULL;
 445 }
 446
 447 static int u32_delete(struct tcf_proto *tp, unsigned long arg)
 448 {
 449         struct tc_u_hnode *ht = (struct tc_u_hnode*)arg;
 450
 451         if (ht == NULL)
 452                 return 0;
 453
 454         if (TC_U32_KEY(ht->handle))
 455                 return u32_delete_key(tp, (struct tc_u_knode*)ht);
 456
 457         if (tp->root == ht)
 458                 return -EINVAL;
 459
 460         if (--ht->refcnt == 0)
 461                 u32_destroy_hnode(tp, ht);
 462
 463         return 0;
 464 }
 465
 466 static u32 gen_new_kid(struct tc_u_hnode *ht, u32 handle)
 467 {
 468         struct tc_u_knode *n;
 469         unsigned i = 0x7FF;
 470
 471         for (n=ht->ht[TC_U32_HASH(handle)]; n; n = n->next)
 472                 if (i < TC_U32_NODE(n->handle))
 473                         i = TC_U32_NODE(n->handle);
 474         i++;
 475
 476         return handle|(i>0xFFF ? 0xFFF : i);
 477 }
 478
 479 static int u32_set_parms(struct tcf_proto *tp, unsigned long base,
 480                          struct tc_u_hnode *ht,
 481                          struct tc_u_knode *n, struct rtattr **tb,
 482                          struct rtattr *est)
 483 {
 484         int err;
 485         struct tcf_exts e;
 486
 487         err = tcf_exts_validate(tp, tb, est, &e, &u32_ext_map);
 488         if (err < 0)
 489                 return err;
 490
 491         err = -EINVAL;
 492         if (tb[TCA_U32_LINK-1]) {
 493                 u32 handle = *(u32*)RTA_DATA(tb[TCA_U32_LINK-1]);
 494                 struct tc_u_hnode *ht_down = NULL;
 495
 496                 if (TC_U32_KEY(handle))
 497                         goto errout;
 498
 499                 if (handle) {
 500                         ht_down = u32_lookup_ht(ht->tp_c, handle);
 501
 502                         if (ht_down == NULL)
 503                                 goto errout;
 504                         ht_down->refcnt++;
 505                 }
 506
 507                 tcf_tree_lock(tp);
 508                 ht_down = xchg(&n->ht_down, ht_down);
 509                 tcf_tree_unlock(tp);
 510
 511                 if (ht_down)
 512                         ht_down->refcnt--;
 513         }
 514         if (tb[TCA_U32_CLASSID-1]) {
 515                 n->res.classid = *(u32*)RTA_DATA(tb[TCA_U32_CLASSID-1]);
 516                 tcf_bind_filter(tp, &n->res, base);
 517         }
 518
 519 #ifdef CONFIG_NET_CLS_IND
 520         if (tb[TCA_U32_INDEV-1]) {
 521                 int err = tcf_change_indev(tp, n->indev, tb[TCA_U32_INDEV-1]);
 522                 if (err < 0)
 523                         goto errout;
 524         }
 525 #endif
 526         tcf_exts_change(tp, &n->exts, &e);
 527
 528         return 0;
 529 errout:
 530         tcf_exts_destroy(tp, &e);
 531         return err;
 532 }
 533
 534 static int u32_change(struct tcf_proto *tp, unsigned long base, u32 handle,
 535                       struct rtattr **tca,
 536                       unsigned long *arg)
 537 {
 538         struct tc_u_common *tp_c = tp->data;
 539         struct tc_u_hnode *ht;
 540         struct tc_u_knode *n;
 541         struct tc_u32_sel *s;
 542         struct rtattr *opt = tca[TCA_OPTIONS-1];
 543         struct rtattr *tb[TCA_U32_MAX];
 544         u32 htid;
 545         int err;
 546
 547         if (opt == NULL)
 548                 return handle ? -EINVAL : 0;
 549
 550         if (rtattr_parse_nested(tb, TCA_U32_MAX, opt) < 0)
 551                 return -EINVAL;
 552
 553         if ((n = (struct tc_u_knode*)*arg) != NULL) {
 554                 if (TC_U32_KEY(n->handle) == 0)
 555                         return -EINVAL;
 556
 557                 return u32_set_parms(tp, base, n->ht_up, n, tb, tca[TCA_RATE-1]);
 558         }
 559
 560         if (tb[TCA_U32_DIVISOR-1]) {
 561                 unsigned divisor = *(unsigned*)RTA_DATA(tb[TCA_U32_DIVISOR-1]);
 562
 563                 if (--divisor > 0x100)
 564                         return -EINVAL;
 565                 if (TC_U32_KEY(handle))
 566                         return -EINVAL;
 567                 if (handle == 0) {
 568                         handle = gen_new_htid(tp->data);
 569                         if (handle == 0)
 570                                 return -ENOMEM;
 571                 }
 572                 ht = kzalloc(sizeof(*ht) + divisor*sizeof(void*), GFP_KERNEL);
 573                 if (ht == NULL)
 574                         return -ENOBUFS;
 575                 ht->tp_c = tp_c;
 576                 ht->refcnt = 0;
 577                 ht->divisor = divisor;
 578                 ht->handle = handle;
 579                 ht->prio = tp->prio;
 580                 ht->next = tp_c->hlist;
 581                 tp_c->hlist = ht;
 582                 *arg = (unsigned long)ht;
 583                 return 0;
 584         }
 585
 586         if (tb[TCA_U32_HASH-1]) {
 587                 htid = *(unsigned*)RTA_DATA(tb[TCA_U32_HASH-1]);
 588                 if (TC_U32_HTID(htid) == TC_U32_ROOT) {
 589                         ht = tp->root;
 590                         htid = ht->handle;
 591                 } else {
 592                         ht = u32_lookup_ht(tp->data, TC_U32_HTID(htid));
 593                         if (ht == NULL)
 594                                 return -EINVAL;
 595                 }
 596         } else {
 597                 ht = tp->root;
 598                 htid = ht->handle;
 599         }
 600
 601         if (ht->divisor < TC_U32_HASH(htid))
 602                 return -EINVAL;
 603
 604         if (handle) {
 605                 if (TC_U32_HTID(handle) && TC_U32_HTID(handle^htid))
 606                         return -EINVAL;
 607                 handle = htid | TC_U32_NODE(handle);
 608         } else
 609                 handle = gen_new_kid(ht, htid);
 610
 611         if (tb[TCA_U32_SEL-1] == 0 ||
 612             RTA_PAYLOAD(tb[TCA_U32_SEL-1]) < sizeof(struct tc_u32_sel))
 613                 return -EINVAL;
 614
 615         s = RTA_DATA(tb[TCA_U32_SEL-1]);
 616
 617         n = kzalloc(sizeof(*n) + s->nkeys*sizeof(struct tc_u32_key), GFP_KERNEL);
 618         if (n == NULL)
 619                 return -ENOBUFS;
 620
 621 #ifdef CONFIG_CLS_U32_PERF
 622         n->pf = kzalloc(sizeof(struct tc_u32_pcnt) + s->nkeys*sizeof(u64), GFP_KERNEL);
 623         if (n->pf == NULL) {
 624                 kfree(n);
 625                 return -ENOBUFS;
 626         }
 627 #endif
 628
 629         memcpy(&n->sel, s, sizeof(*s) + s->nkeys*sizeof(struct tc_u32_key));
 630         n->ht_up = ht;
 631         n->handle = handle;
 632 {
 633         u8 i = 0;
 634         u32 mask = s->hmask;
 635         if (mask) {
 636                 while (!(mask & 1)) {
 637                         i++;
 638                         mask>>=1;
 639                 }
 640         }
 641         n->fshift = i;
 642 }
 643
 644 #ifdef CONFIG_CLS_U32_MARK
 645         if (tb[TCA_U32_MARK-1]) {
 646                 struct tc_u32_mark *mark;
 647
 648                 if (RTA_PAYLOAD(tb[TCA_U32_MARK-1]) < sizeof(struct tc_u32_mark)) {
 649 #ifdef CONFIG_CLS_U32_PERF
 650                         kfree(n->pf);
 651 #endif
 652                         kfree(n);
 653                         return -EINVAL;
 654                 }
 655                 mark = RTA_DATA(tb[TCA_U32_MARK-1]);
 656                 memcpy(&n->mark, mark, sizeof(struct tc_u32_mark));
 657                 n->mark.success = 0;
 658         }
 659 #endif
 660
 661         err = u32_set_parms(tp, base, ht, n, tb, tca[TCA_RATE-1]);
 662         if (err == 0) {
 663                 struct tc_u_knode **ins;
 664                 for (ins = &ht->ht[TC_U32_HASH(handle)]; *ins; ins = &(*ins)->next)
 665                         if (TC_U32_NODE(handle) < TC_U32_NODE((*ins)->handle))
 666                                 break;
 667
 668                 n->next = *ins;
 669                 wmb();
 670                 *ins = n;
 671
 672                 *arg = (unsigned long)n;
 673                 return 0;
 674         }
 675 #ifdef CONFIG_CLS_U32_PERF
 676         kfree(n->pf);
 677 #endif
 678         kfree(n);
 679         return err;
 680 }
 681
 682 static void u32_walk(struct tcf_proto *tp, struct tcf_walker *arg)
 683 {
 684         struct tc_u_common *tp_c = tp->data;
 685         struct tc_u_hnode *ht;
 686         struct tc_u_knode *n;
 687         unsigned h;
 688
 689         if (arg->stop)
 690                 return;
 691
 692         for (ht = tp_c->hlist; ht; ht = ht->next) {
 693                 if (ht->prio != tp->prio)
 694                         continue;
 695                 if (arg->count >= arg->skip) {
 696                         if (arg->fn(tp, (unsigned long)ht, arg) < 0) {
 697                                 arg->stop = 1;
 698                                 return;
 699                         }
 700                 }
 701                 arg->count++;
 702                 for (h = 0; h <= ht->divisor; h++) {
 703                         for (n = ht->ht[h]; n; n = n->next) {
 704                                 if (arg->count < arg->skip) {
 705                                         arg->count++;
 706                                         continue;
 707                                 }
 708                                 if (arg->fn(tp, (unsigned long)n, arg) < 0) {
 709                                         arg->stop = 1;
 710                                         return;
 711                                 }
 712                                 arg->count++;
 713                         }
 714                 }
 715         }
 716 }
 717
 718 static int u32_dump(struct tcf_proto *tp, unsigned long fh,
 719                      struct sk_buff *skb, struct tcmsg *t)
 720 {
 721         struct tc_u_knode *n = (struct tc_u_knode*)fh;
 722         unsigned char    *b = skb->tail;
 723         struct rtattr *rta;
 724
 725         if (n == NULL)
 726                 return skb->len;
 727
 728         t->tcm_handle = n->handle;
 729
 730         rta = (struct rtattr*)b;
 731         RTA_PUT(skb, TCA_OPTIONS, 0, NULL);
 732
 733         if (TC_U32_KEY(n->handle) == 0) {
 734                 struct tc_u_hnode *ht = (struct tc_u_hnode*)fh;
 735                 u32 divisor = ht->divisor+1;
 736                 RTA_PUT(skb, TCA_U32_DIVISOR, 4, &divisor);
 737         } else {
 738                 RTA_PUT(skb, TCA_U32_SEL,
 739                         sizeof(n->sel) + n->sel.nkeys*sizeof(struct tc_u32_key),
 740                         &n->sel);
 741                 if (n->ht_up) {
 742                         u32 htid = n->handle & 0xFFFFF000;
 743                         RTA_PUT(skb, TCA_U32_HASH, 4, &htid);
 744                 }
 745                 if (n->res.classid)
 746                         RTA_PUT(skb, TCA_U32_CLASSID, 4, &n->res.classid);
 747                 if (n->ht_down)
 748                         RTA_PUT(skb, TCA_U32_LINK, 4, &n->ht_down->handle);
 749
 750 #ifdef CONFIG_CLS_U32_MARK
 751                 if (n->mark.val || n->mark.mask)
 752                         RTA_PUT(skb, TCA_U32_MARK, sizeof(n->mark), &n->mark);
 753 #endif
 754
 755                 if (tcf_exts_dump(skb, &n->exts, &u32_ext_map) < 0)
 756                         goto rtattr_failure;
 757
 758 #ifdef CONFIG_NET_CLS_IND
 759                 if(strlen(n->indev))
 760                         RTA_PUT(skb, TCA_U32_INDEV, IFNAMSIZ, n->indev);
 761 #endif
 762 #ifdef CONFIG_CLS_U32_PERF
 763                 RTA_PUT(skb, TCA_U32_PCNT,
 764                 sizeof(struct tc_u32_pcnt) + n->sel.nkeys*sizeof(u64),
 765                         n->pf);
 766 #endif
 767         }
 768
 769         rta->rta_len = skb->tail - b;
 770         if (TC_U32_KEY(n->handle))
 771                 if (tcf_exts_dump_stats(skb, &n->exts, &u32_ext_map) < 0)
 772                         goto rtattr_failure;
 773         return skb->len;
 774
 775 rtattr_failure:
 776         skb_trim(skb, b - skb->data);
 777         return -1;
 778 }
 779
 780 static struct tcf_proto_ops cls_u32_ops = {
 781         .next           =       NULL,
 782         .kind           =       "u32",
 783         .classify       =       u32_classify,
 784         .init           =       u32_init,
 785         .destroy        =       u32_destroy,
 786         .get            =       u32_get,
 787         .put            =       u32_put,
 788         .change         =       u32_change,
 789         .delete         =       u32_delete,
 790         .walk           =       u32_walk,
 791         .dump           =       u32_dump,
 792         .owner          =       THIS_MODULE,
 793 };
 794
 795 static int __init init_u32(void)
 796 {
 797         printk("u32 classifier\n");
 798 #ifdef CONFIG_CLS_U32_PERF
 799         printk("    Performance counters on\n");
 800 #endif
 801 #ifdef CONFIG_NET_CLS_POLICE
 802         printk("    OLD policer on \n");
 803 #endif
 804 #ifdef CONFIG_NET_CLS_IND
 805         printk("    input device check on \n");
 806 #endif
 807 #ifdef CONFIG_NET_CLS_ACT
 808         printk("    Actions configured \n");
 809 #endif
 810         return register_tcf_proto_ops(&cls_u32_ops);
 811 }
 812
 813 static void __exit exit_u32(void)
 814 {
 815         unregister_tcf_proto_ops(&cls_u32_ops);
 816 }
 817
 818 module_init(init_u32)
 819 module_exit(exit_u32)
 820 MODULE_LICENSE("GPL");